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Science News for September 25, 2020


New method allows precise gene control by light

A novel optical switch enables precise control over the lifespan of genetic copies by attaching aptamers to molecular markers. This method can be used to specifically switch off practically every mRNA molecule in a cell in a controlled manner, opening up new avenues for investigating dynamic processes in living cells.

SourceUniversity of Bonn·JournalNature Communications·DateSep 25, 2020

160 genes linked to brain shrinkage in study of 45,000 adults

A study of 45,000 healthy adults found associations between 160 genes and brain shrinkage in the cortex, a dimply outer layer of the brain. The findings may lead to new targets for developing drugs to intervene before disease symptoms appear.

SourceUniversity of Texas Health Science Center at San Antonio·JournalNature Communications·DateSep 25, 2020
SAMSUNG T9 Portable SSD 2TB

SAMSUNG T9 Portable SSD 2TB transfers large imagery and model outputs quickly between field laptops, lab workstations, and secure archives.

Spin clean-up method brings practical quantum computers closer to reality

Researchers at Osaka City University have developed a quantum algorithm that removes pesky spin contaminants from chemical calculations on quantum computers. This breakthrough enables precise and accurate predictions of atomic and molecular behavior, which is crucial for applications such as pharmaceuticals and materials research.

SourceOsaka City University·DateSep 25, 2020

A new twist on public health tick surveillance

Researchers aim to pinpoint specific areas with the highest risk of tick-borne disease transmission using GPS data loggers and interviews with people with tick-borne diseases. The study's findings will inform targeted interventions to address a major public health threat in the US.

SourceUniversity of Massachusetts Amherst·DateSep 25, 2020
Apple iPad Pro 11-inch (M4)

Apple iPad Pro 11-inch (M4) runs demanding GIS, imaging, and annotation workflows on the go for surveys, briefings, and lab notebooks.

FSU researchers help develop sustainable polymers

Researchers at FSU have made new discoveries on the effects of temperature on sustainable polymers, which may help produce environmentally friendly plastics. The team found that certain polymers crystallize in unusual ways when cooled, leading to increased toughness and potential applications for sustainable plastic production.

SourceFlorida State University·JournalMacromolecules·DateSep 25, 2020

Not just a phase

University of Pittsburgh professors Nathan Youngblood and Feng Xiong receive $380,000 to study phase-change materials for high-speed computing and optical storage applications. The project aims to overcome the challenges in electrically-controlled optical memory devices.

SourceUniversity of Pittsburgh·DateSep 25, 2020
Apple iPhone 17 Pro

Apple iPhone 17 Pro delivers top performance and advanced cameras for field documentation, data collection, and secure research communications.

Pair of massive baby stars swaddled in salty water vapor

The team discovered two massive young stars shrouded by gaseous disks containing sodium chloride and heated water vapor. The disks are counter-rotating, indicating the pair may not be twins, but rather strangers formed in separate clouds.

SourceNational Institutes of Natural Sciences·JournalThe Astrophysical Journal Letters·DateSep 25, 2020

A clearer view of what makes glass rigid

The University of Tokyo researchers employed a new computer model to simulate amorphous solids and their strength. They found that the internal network of force-bearing particles is responsible for giving glass its rigidity.

SourceInstitute of Industrial Science, The University of Tokyo·JournalNature Communications·DateSep 25, 2020
Kestrel 3000 Pocket Weather Meter

Kestrel 3000 Pocket Weather Meter measures wind, temperature, and humidity in real time for site assessments, aviation checks, and safety briefings.

Changes by income level in cardiovascular disease in US

Researchers found a significant decline in cardiovascular disease prevalence among high-income individuals in the US from 1999 to 2016. The study also revealed disparities in cardiovascular disease burden by income level within the US population.

SourceJAMA Network·JournalJAMA Network Open·DateSep 25, 2020

"Stretching rack" for cells

Researchers create micro-scaffolds that stretch cells, triggering a response to external forces. The cells counteract deformation with motor proteins, increasing their tensile forces and adapting to dynamic environments.

SourceKarlsruher Institut für Technologie (KIT)·JournalScience Advances·DateSep 25, 2020
GoPro HERO13 Black

GoPro HERO13 Black records stabilized 5.3K video for instrument deployments, field notes, and outreach, even in harsh weather and underwater conditions.

Nerve cells let others "listen in"

A recent study published in Neuron reveals that the brain's signal transmission is regulated by the environment, with certain processes allowing for more open communication between neurons. The researchers found that astrocytes, specialized cells in the brain, play a crucial role in shielding communication to some extent.

SourceUniversity of Bonn·JournalNeuron·DateSep 25, 2020

Contact tracing study results recommend consistent wearing of masks, handwashing, and social distancing in public to protect against SARS-CoV-2 infection

A contact tracing study found that wearing masks all the time reduced COVID-19 infection risk by 77% compared to not wearing them. Consistent practice of handwashing and social distancing also significantly reduced the risk, with benefits observed when maintaining at least a 1-metre distance from patients.

SourceEuropean Society of Clinical Microbiology and Infectious Diseases·DateSep 25, 2020

NASA finds wind shear displacing Lowell's strongest storms

NASA's Aqua satellite detected infrared data showing westerly vertical wind shear pushing strongest storms east of Tropical Storm Lowell's center, indicating wind shear. The storm's convection and distance from the center were on the margins of organized deep convection.

SourceNASA/Goddard Space Flight Center·DateSep 25, 2020
Sky-Watcher EQ6-R Pro Equatorial Mount

Sky-Watcher EQ6-R Pro Equatorial Mount provides precise tracking capacity for deep-sky imaging rigs during long astrophotography sessions.

New Duchenne muscular dystrophy drug shows benefit in Duke trial

A new drug, vamorolone, has shown promise in reducing side effects associated with current steroid treatments for Duchenne muscular dystrophy. Interim results from a 24-month clinical trial suggest that vamorolone may retain or improve the therapeutic benefits of steroids while minimizing risks.

SourceDuke University Medical Center·JournalPLOS Medicine·DateSep 25, 2020

Primate brain size does not predict their intelligence

A research team from the German Primate Center found that lemurs' average cognitive performance in tests was not fundamentally different from other primate species. Despite smaller brains, lemurs showed domain-specific cognitive skills similar to those of monkeys and great apes.

SourceDeutsches Primatenzentrum (DPZ)/German Primate Center·JournalPeerJ·DateSep 25, 2020

Study delivers new knowledge about what causes thunderstorms and cloud bursts

A study by University of Copenhagen researchers reveals that large temperature differences between day and night can spawn powerful thunderstorms and cloud bursts. The study uses computer simulations to analyze mesoscale convection systems, which are powerful thunderstorms that spread over areas of 100 kilometers or more.

SourceUniversity of Copenhagen·JournalNature Climate Change·DateSep 25, 2020
CalDigit TS4 Thunderbolt 4 Dock

CalDigit TS4 Thunderbolt 4 Dock simplifies serious desks with 18 ports for high-speed storage, monitors, and instruments across Mac and PC setups.

University of Minnesota receives seed funding for clinical study of metformin to treat, prevent COVID-19

Researchers at University of Minnesota Medical School have received seed funding for a clinical study investigating the use of metformin as a COVID-19 treatment and prevention method. The team aims to definitively study whether or not metformin prevents SARS-CoV-2 infection and severe COVID-19 disease, with potential benefits of reduci...

SourceUniversity of Minnesota Medical School·DateSep 25, 2020

LSU physicists develop a method to improve gravitational wave detector sensitivity

Researchers at LSU have developed a method to remove quantum backaction in gravitational wave detectors, improving sensitivity and enabling deeper astrophysical observations. The new technique uses a mirror the size of a human hair and shows promising results, with potential implications for LIGO and future GW detector upgrades.

SourceLouisiana State University·JournalPhysical Review X·DateSep 25, 2020
Creality K1 Max 3D Printer

Creality K1 Max 3D Printer rapidly prototypes brackets, adapters, and fixtures for instruments and classroom demonstrations at large build volume.

Bird genes are multitaskers, say scientists

Researchers found that male and female birds have different gene expressions due to alternative splicing, enabling the evolution of sex-specific traits. This process is crucial for generating biodiversity across the animal kingdom.

SourceUniversity of Sheffield·JournalMolecular Biology and Evolution·DateSep 25, 2020

Catalyzing an improved arterial bypass graft

A team from the University of Pittsburgh is using a $1.1M grant to optimize small-diameter tissue-engineered vascular graft design and manufacturability. They aim to develop a feasible alternative to decades-old vessel harvesting methods, with the goal of reducing complications like stenosis.

SourceUniversity of Pittsburgh·DateSep 25, 2020

High-performance single-atom catalysts for high-temperature fuel cells

Researchers have developed a novel single-atom Pt catalyst that can operate stably at high temperatures, increasing electrode reaction rates by up to 10 times. This breakthrough could accelerate the commercialization of solid oxide fuel cells, next-generation eco-friendly power generation systems.

SourceNational Research Council of Science & Technology·JournalEnergy & Environmental Science·DateSep 25, 2020

Switching up: Marine bacteria shift between lifestyles to get the best resources

Researchers from the University of Tsukuba and ETH Zurich found that marine bacteria switch between lifestyles to get the best resources, optimizing nutrient uptake in seascapes of organic particles. Bacteria spend more time on higher-quality patches, fine-tuning their foraging strategy according to patch quality.

SourceUniversity of Tsukuba·JournalProceedings of the National Academy of Sciences·DateSep 25, 2020
Fluke 87V Industrial Digital Multimeter

Fluke 87V Industrial Digital Multimeter is a trusted meter for precise measurements during instrument integration, repairs, and field diagnostics.

Coldest Northern Hemisphere temperature, first recorded by UW, officially confirmed

The University of Wisconsin-Madison has officially confirmed the lowest recorded temperature in the Northern Hemisphere, a chilly -93.2 degrees Fahrenheit. This extreme reading was first detected in Greenland in 1991 and has been verified through rigorous review processes by the World Meteorological Organization.

SourceUniversity of Wisconsin-Madison·JournalQuarterly Journal of the Royal Meteorological Society·DateSep 25, 2020

Women could conceive after ovarian tumors

A study from Karolinska Institutet in Sweden found that women receiving fertility-sparing surgery for treatment of borderline ovarian tumours were able to have children, with most preserving natural fertility. The study also showed similar survival rates as those who underwent radical surgical cancer treatment.

SourceKarolinska Institutet·JournalFertility and Sterility·DateSep 25, 2020

Dartmouth study offers new details on pediatric mental health boarding

A Dartmouth-led study reveals that pediatric mental health boarding is a prevalent and understudied issue, affecting 40,000 to 66,000 youth admitted to hospitals each year. The research team found key risk factors for children, including age, suicidal thoughts, and seasonal hospital visits.

SourceThe Geisel School of Medicine at Dartmouth·JournalPEDIATRICS·DateSep 25, 2020

An app monitors cancer patients' health status and rewards participation

A new app called Close2U has been developed to monitor the physical and mental health of cancer patients using gamification. The app rewards users with advice or songs for answering daily questions about their mood and pain levels, promoting motivation and continuous monitoring.

SourceUniversidad Complutense de Madrid·JournalJournal of Healthcare Engineering·DateSep 25, 2020
Davis Instruments Vantage Pro2 Weather Station

Davis Instruments Vantage Pro2 Weather Station offers research-grade local weather data for networked stations, campuses, and community observatories.

COVID-19 spurs anxious, upsetting dreams

Research published by the American Psychological Association found that COVID-19 is affecting women's dreams more strongly than men's, with increased anxiety and negative emotions. The studies suggest that changes in dream frequency, tone, and content can help identify those at risk for mental health problems during the pandemic.

SourceAmerican Psychological Association·JournalDreaming·DateSep 25, 2020

Novel educational program puts a human face on biomedical research

The TL1 program requires students to shadow physicians treating patients with diseases at the center of their research, bridging basic science and clinical cultures. This rotation provides a two-way street of education, where students learn about patient problems and bring basic science questions to address them.

SourceMedical University of South Carolina·JournalJournal of Clinical and Translational Science·DateSep 25, 2020
Apple AirPods Pro (2nd Generation, USB-C)

Apple AirPods Pro (2nd Generation, USB-C) provide clear calls and strong noise reduction for interviews, conferences, and noisy field environments.

Ascorbic acid-mediated reactions in organic synthesis

Researchers explore ascorbic acid's role in organic synthesis, revealing its potential as a catalyst for diverse reactions and its unique mechanistic pathways. This study contributes to green chemistry by demonstrating the versatility of ascorbic acid in environmentally benign processes.

SourceBentham Science Publishers·JournalCurrent Organocatalysis·DateSep 25, 2020

New study highlights success of a mobile outreach van helping people on the street w

A mobile health program has proven effective in bringing opioid addiction treatment services to marginalized individuals, particularly the homeless. The Community Care in Reach program uses a non-traditional combination of clinical care and harm reduction services, resulting in improved access to evidence-based services.

SourceMassachusetts General Hospital·JournalFrontiers in Public Health·DateSep 25, 2020
Rigol DP832 Triple-Output Bench Power Supply

Rigol DP832 Triple-Output Bench Power Supply powers sensors, microcontrollers, and test circuits with programmable rails and stable outputs.

Comparing face coverings in controlling expired particles

Researchers tested various mask types against expired particles, finding surgical and N95 masks block up to 90% of particles. Cloth masks, however, released a large amount of fibers into the air, emphasizing the importance of regular washing.

SourceUniversity of California - Davis·JournalScientific Reports·DateSep 25, 2020

An enhanced ruthenium-based catalyst for primary amine synthesis

Tokyo Tech researchers have developed a heterogeneous ruthenium-based catalyst capable of driving direct amination of alcohols to produce primary amines without hydrogen gas. The system achieved higher yields and showed potential for reuse, making it a cost-effective and environmentally friendly method.

SourceTokyo Institute of Technology·JournalChemical Science·DateSep 25, 2020
Apple Watch Series 11 (GPS, 46mm)

Apple Watch Series 11 (GPS, 46mm) tracks health metrics and safety alerts during long observing sessions, fieldwork, and remote expeditions.

First measurements of radiation levels on the moon

Scientists from Chinese and German institutions report on time-resolved measurements of lunar surface radiation, revealing an equivalent dose rate of about 60 microsieverts per hour. This poses considerable exposure for humans, highlighting the need for shielding during long-term moon stays.

SourceKiel University·JournalScience Advances·DateSep 25, 2020

The surprising organization of avian brains

A research team has cleared up 150 years of false assumptions about bird brains. The study found that avian brains are organized similarly to mammalian brains, with fibers arranged horizontally and vertically in columns.

SourceRuhr-University Bochum·JournalScience·DateSep 25, 2020

Low level alcohol use during pregnancy can impact child's brain development

Research finds that even low levels of alcohol consumption during pregnancy can impact a child's brain development, leading to anxiety, depression, and poor attention. The study, published in the American Journal of Psychiatry, suggests that any alcohol use during pregnancy is associated with subtle yet significant behavioural and psyc...

SourceUniversity of Sydney·JournalAmerican Journal of Psychiatry·DateSep 25, 2020

New storage battery more efficient and heat-resistant

Researchers at Friedrich Schiller University Jena have developed a new polymer electrolyte that improves the efficiency and heat-resistance of redox flow batteries. This breakthrough enables the use of renewable energy sources without significant losses or additional effort.

SourceFriedrich-Schiller-Universitaet Jena·JournalAdvanced Energy Materials·DateSep 25, 2020

COVID-19 news from Annals of Internal Medicine

The National Institutes of Health COVID-19 Treatment Guidelines Panel has expressed uncertainty about the efficacy and safety of convalescent plasma for treating COVID-19. The panel's analysis, published in Annals of Internal Medicine, highlights the need for more data before making recommendations on the treatment.

SourceAmerican College of Physicians·JournalAnnals of Internal Medicine·DateSep 25, 2020
Nikon Monarch 5 8x42 Binoculars

Nikon Monarch 5 8x42 Binoculars deliver bright, sharp views for wildlife surveys, eclipse chases, and quick star-field scans at dark sites.

RAP tag: A new protein purification approach

Researchers from the University of Tsukuba have developed a new tagging system for detecting and purifying proteins in plant cells, using a short sequence called RAP tag. The approach shows high affinity and specificity, making it a powerful tool for protein purification, particularly at low expression levels.

SourceUniversity of Tsukuba·JournalFrontiers in Plant Science·DateSep 25, 2020

Stem cells can repair Parkinson's-damaged circuits in mouse brains

Researchers at the University of Wisconsin-Madison have developed a stem cell treatment that repairs Parkinson's-damaged brain circuits in mice. The treatment involves coaxing human embryonic stem cells to differentiate into dopamine-producing neurons, which then integrate into the correct regions of the brain and restore motor functions.

SourceUniversity of Wisconsin-Madison·JournalCell Stem Cell·DateSep 25, 2020
Aranet4 Home CO2 Monitor

Aranet4 Home CO2 Monitor tracks ventilation quality in labs, classrooms, and conference rooms with long battery life and clear e-ink readouts.

Cocaine addiction: Impact of genetic mutations elucidated

Research reveals two gene mutations in nicotinic receptors may confer 'protection' against cocaine addiction by modulating an early phase in the addiction cycle. The mutations reduce voluntary intake of cocaine and slow transition from first use to signs of addiction.

SourceInstitut Pasteur·JournalProgress in Neurobiology·DateSep 25, 2020

A better alternative to Phthalates?

Researchers analyzed urine samples from 100 pregnant women to detect DINCH metabolites, finding concentrations in most samples but no evidence of hormone disruption. The study found higher concentrations in African American women compared to Caucasian women, highlighting the need for further research on potential disparities.

SourceNational Institute of Standards and Technology (NIST)·JournalChemosphere·DateSep 25, 2020

Materials scientists learn how to make liquid crystal shape-shift

Materials scientists at UC San Diego create a 3D-printing method that allows for the creation of shapes with varying degrees of stiffness and actuation. The breakthrough enables the manufacture of soft robots, artificial muscles, and wearable devices with improved properties.

SourceUniversity of California - San Diego·JournalScience Advances·DateSep 25, 2020
Anker Laptop Power Bank 25,000mAh (Triple 100W USB-C)

Anker Laptop Power Bank 25,000mAh (Triple 100W USB-C) keeps Macs, tablets, and meters powered during extended observing runs and remote surveys.

Ultrapotent compound may help treat C. diff, reduce recurrence

Researchers have created ultrapotent compounds to treat Clostridioides difficile (C. diff), a leading cause of healthcare-associated infections in the US. The compounds show significant advantages over current antibiotics, including minimum inhibitory concentration values as low as 0.003 μg/mL and improved prevention of recurrence.

SourcePurdue University·JournalJournal of Medicinal Chemistry·DateSep 25, 2020

Study demonstrates SARS-CoV-2 emergence was associated with a large drop in the circulation of other respiratory viruses during the first wave

A study found that SARS-CoV-2 emergence was associated with a significant decrease in the circulation of other common respiratory viruses. Patients with COVID-19 had worse clinical outcomes and were more likely to develop pneumonia compared to those with co-infections.

SourceEuropean Society of Clinical Microbiology and Infectious Diseases·DateSep 25, 2020

Potential drug target for dangerous E. coli infections identified

Researchers at UNSW Science discovered a new molecular pathway that controls Shiga toxin production in E. coli, which could lead to the development of drugs suppressing toxin production during infections. The study's findings provide a potential breakthrough for treating severe E. coli infections.

SourceUniversity of New South Wales·JournalProceedings of the National Academy of Sciences·DateSep 25, 2020
Garmin GPSMAP 67i with inReach

Garmin GPSMAP 67i with inReach provides rugged GNSS navigation, satellite messaging, and SOS for backcountry geology and climate field teams.

The male Y chromosome does more than we thought

A recent study published in Scientific Reports has found that Y chromosome genes may regulate cellular functions differently than previously thought, potentially explaining why men are more susceptible to certain diseases like Covid-19. The discovery could also provide insights into the underlying mechanisms of male health disparities.

SourceUniversity of Montreal·JournalScientific Reports·DateSep 25, 2020

PLUS takes 3D ultrasound images of solids

Researchers developed a new technology called PLUS to produce high-resolution 3D images of defects in metallic structures. This innovation uses non-destructive techniques to study structural integrity and identify potential flaws.

SourceTohoku University·JournalApplied Physics Letters·DateSep 25, 2020

Researchers advancing decadal predictions

Researchers are advancing decadal predictions by applying a multivariate statistical framework to climate models. They aim to improve understanding of climate variability and predictability.

SourceGeorge Mason University·DateSep 25, 2020
Meta Quest 3 512GB

Meta Quest 3 512GB enables immersive mission planning, terrain rehearsal, and interactive STEM demos with high-resolution mixed-reality experiences.

UTIA to lead regional effort to battle farmer, rancher stress

The University of Tennessee Institute of Agriculture has been chosen to coordinate a regional effort to address farmer and rancher stress in the South. The three-year project aims to provide stress management assistance for people in farming, ranching, and other agriculture-related occupations as well as their families.

SourceUniversity of Tennessee Institute of Agriculture·DateSep 25, 2020

Faced with shortages, researchers combine heat and humidity to disinfect N95 masks

A team of researchers at SLAC National Accelerator Laboratory and University of Texas Medical Branch has developed a method to disinfect N95 masks using moderate heat and high relative humidity. This process extends the ability to reuse masks, potentially reducing shortages, and can also be used to decontaminate other viruses.

SourceDOE/SLAC National Accelerator Laboratory·JournalACS Nano·DateSep 25, 2020

Columbia leads effort to develop a quantum simulator

A multidisciplinary research team led by Columbia University is developing a quantum simulator to tackle real-world challenges. The project, funded by a $1 million NSF Convergence Accelerator award, aims to create a device that can solve problems difficult for classical computers.

SourceColumbia University·DateSep 25, 2020

Study shows Massachusetts response to COVID-19 in nursing homes helped stem infection rate

A study found that adherence to infection control processes, including proper wearing of PPE and cohorting strategies, was significantly associated with declines in weekly infection and mortality rates. The Massachusetts COVID-19 response in nursing homes helped stem the rate of infection among vulnerable residents through a state-wide...

SourceHebrew SeniorLife Hinda and Arthur Marcus Institute for Aging Research·JournalJournal of the American Geriatrics Society·DateSep 25, 2020
Sony Alpha a7 IV (Body Only)

Sony Alpha a7 IV (Body Only) delivers reliable low-light performance and rugged build for astrophotography, lab documentation, and field expeditions.

Ultrapotent antibody mix blocks COVID-19 virus attachment

A cocktail of powerful antibodies from recovered COVID-19 patients locks down the infection machinery, preventing the virus from entering cells. The antibodies protect hamsters from infection when exposed to the coronavirus, also setting off the infection-fighting actions of other immune cells.

SourceUniversity of Washington School of Medicine/UW Medicine·JournalScience·DateSep 25, 2020

Criticism of COVID-19 models by democratic political leaders may erode public trust in science

A study finds that criticism of COVID-19 models by Democratic elites undermines public support for the models and science more broadly. Republicans have little impact on public attitudes towards models. Scientists should acknowledge model uncertainty and convey what is known about the virus to build trust.

SourceAmerican Association for the Advancement of Science (AAAS)·JournalScience Advances·DateSep 25, 2020

How to better understand what makes a virus win during transmission?

The study proposes a mathematical model to understand the interactions between microorganisms within hosts and their transmission ability. The framework allows for the prediction of infection trajectories in single hosts and transmission in host populations, even considering complex interactions and stochasticity.

SourceInstituto Gulbenkian de Ciencia·JournalFrontiers in Microbiology·DateSep 25, 2020
Apple MacBook Pro 14-inch (M4 Pro)

Apple MacBook Pro 14-inch (M4 Pro) powers local ML workloads, large datasets, and multi-display analysis for field and lab teams.

Marine heatwaves are human made

Marine heatwaves have increased significantly due to global warming, with major events becoming more frequent and prolonged. The probability of such events has risen massively, posing a serious threat to marine ecosystems and their ability to recover.

SourceUniversity of Bern·JournalScience·DateSep 25, 2020

Fast, accurate and non-destructive: the new method to analyze food quality

Researchers develop prediction models for spinach quality and safety using portable NIRS sensors, offering a fast, accurate, environmentally friendly, affordable and non-destructive solution. This technology has the potential to revolutionize quality control systems in the food industry.

SourceUniversity of Córdoba·JournalPostharvest Biology and Technology·DateSep 25, 2020

Astronomers model, determine how disk galaxies evolve so smoothly

Researchers have advanced studies on galaxy formation, revealing the role of massive clumps in scattering stars and creating smooth galaxy disks. The models show that this process is robust and universal, applying to many types of galaxies.

SourceIowa State University·JournalMonthly Notices of the Royal Astronomical Society·DateSep 25, 2020
GQ GMC-500Plus Geiger Counter

GQ GMC-500Plus Geiger Counter logs beta, gamma, and X-ray levels for environmental monitoring, training labs, and safety demonstrations.