How to judge the accuracy grade of the pressure gauge

A barometer is a scientific instrument used in meteorology to measure atmospheric pressure. Pressure tendency can forecast short term changes in the weather. Numerous measurements of air pressure are used within surface weather analysis. Barometers and pressure altimeters (the most basic and common type of altimeter) are essentially the same instrument, but used for dif...

The length of the bimetallic thermometer protective tube immersed in the measured medium must be longer than that of the temperature sensitive element. Generally, the immersion length is greater than 100 mm, and the immersion length of 0-50 (?) C range is greater than 150 mm, so as to ensure the accuracy of the measurement. Bimetallic thermometers should avoid collision...

Working liquids in liquid thermometers are used to sense temperature changes, So there are three requirements for it: First, the temperature range of liquids should be wide, that is to say, its freezing point should be low and its boiling point should be high. Second, the volume expansion coefficient should be large. Third, liquids should be pure, not stained with glass,...