The instrument that can detect the moisture content in wheat is called a wheat moisture meter. The wheat moisture meter adopts the principle of pyrolysis weight. While measuring the weight of the sample, the infrared heating unit and moisture evaporation channel quickly dry the sample. During the drying process, the moisture meter continuously measures and displays the percentage of moisture content lost in the sample. After the drying program is completed, the final measured moisture content value is locked and displayed, Generally, the sample can be determined in just a few minutes.

The surface of the fiber optic humidity sensor is a layered structure composed of silicon oxide and zirconia with different reflection coefficients. Through advanced thermal curing technology, the pore size of the sensor surface is controlled at 0.3nm, and water molecules at 0.28nm can penetrate. The controller emits a beam of near-infrared light at 790-820nm, which is transmitted to the sensor through a fiber optic cable. The water molecules entering the sensor will change the reflection coefficient of the light, causing a change in wavelength, which is proportional to the moisture content of the medium.