The humidity detector is intended for professional use in the exit control of sawmills or in the entrance inspection of pelleting plants, manufacturers of heating briquettes and other branches of production. The humidity detector determines the absolute humidity of sawdust and other types of biomass such as wood chips, hay, straw. The operation is fast and easy. The sawdust humidity detector is filled, the sample is pressed in the device and after setting the type of sample in the sawdust humidity detector, the moisture can be read. The sawdust humidity detector determines the humidity with the electrical resistance method. The sawdust humidity detector helps to quickly determine the moisture content. Another advantage lies in the practical handling, the small size and the very robust construction. The saw blade moisture meter is factory calibrated.