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What is a mini caliper? How to use?

What is a mini caliper? How to use?

A mini caliper, also known as a cup caliper, is a mechanical measuring device, allowing the size of the specimen to have a compact structure. The measuring range of the ruler is small, usual...

What is a hygrometer?

What is a hygrometer?

Humidity is a physical quantity that refers to the amount of water vapor present in a certain amount of gas. The determination of humidity plays a decisive role in production and daily life....