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On the way to a “new” second

A newly developed ion crystal clock has demonstrated record accuracy, reaching an uncertainty close to the 18th decimal place. This achievement marks a significant step towards redefining the second in the International System of Units (SI), as optical clocks are now 100 times more accurate than current caesium clocks.

Fluke 87V Industrial Digital Multimeter

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

Australia weighs in to make the perfect kilogram

Australian scientists and optical engineers are working with the International Bureau of Weights and Measures to create a perfect sphere from a single crystal of exceptionally pure silicon. The goal is to redefine the kilogram, currently defined by a physical object in France, using a fundamental constant of nature.

Sky & Telescope Pocket Sky Atlas, 2nd Edition

Sky & Telescope Pocket Sky Atlas, 2nd Edition is a durable star atlas for planning sessions, identifying targets, and teaching celestial navigation.