Needle moisture meters

Needle

— such moisture meters are equipped with metal needles and are used to analyze the state of a substance at different depths, which requires puncturing the surface of the material. The needles determine the level of electrical resistance - the higher the humidity, the lower the resistance, and vice versa. Needle moisture meters are calibrated for specific materials. The error of high-quality devices is about 0.5 - 1%. Professional models can analyze moisture content starting from 4 - 5%, and inexpensive ones - from about 9 - 11%.