microwave refractometer

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Refractive index — Refraction of light at the interface between two media. In optics the refractive index or index of refraction of a substance or medium is a measure of the speed of light in that medium. It is expressed as a ratio of the speed of light in vacuum… … Wikipedia
Measuring instrument — Captain Nemo and Professor Aronnax contemplating measuring instruments in Twenty Thousand Leagues Under the Sea … Wikipedia
measuring device — noun instrument that shows the extent or amount or quantity or degree of something • Syn: ↑measuring instrument, ↑measuring system • Hypernyms: ↑instrument • Hyponyms: ↑accelerometer, ↑actinometer, ↑ … Useful english dictionary
measuring instrument — noun instrument that shows the extent or amount or quantity or degree of something • Syn: ↑measuring system, ↑measuring device • Hypernyms: ↑instrument • Hyponyms: ↑accelerometer, ↑actinometer, ↑ … Useful english dictionary
measuring system — noun instrument that shows the extent or amount or quantity or degree of something • Syn: ↑measuring instrument, ↑measuring device • Hypernyms: ↑instrument • Hyponyms: ↑accelerometer, ↑actinometer, ↑ … Useful english dictionary

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