Thermistor Thermometer It is a thermometer that can measure body temperature and room temperature. The resistance value changes with the change of temperature, and the change of volume with temperature is much larger than that of ordinary fixed resistance. The English "thermistor" of a thermistor is a portmanteau of the words Thermal (heat) and resistor (resistance).

Black body In thermodynamics, a black body (English: Black body) is an idealized object that can absorb all external electromagnetic radiation without any reflection or transmission. As the temperature rises, the electromagnetic waves and light radiated by the black body are called black body radiation.

All measurements are subject to some uncertainty. For example, if you use a ruler to measure a distance of 14.5 cm, you cannot be sure that the distance is exactly 14.5 cm because your eyes and the ruler cannot tell the difference between 14.5 and 14.499995.

The blackbody is the reference source used to calibrate the infrared system. Its spectral energy can be obtained by calculation. It is used in industry, laboratory, scientific research and national defense.

According to the needs of use, black body has many forms. Generally speaking, dry blackbody is easy to carry and easy to use, and it is an ideal target source for temperature calibration of temperature measuring instruments.