The instrument converts air ion charge into ion flow with very high efficiency. Therefore, its sensitivity is very high. The instrument is powered by a pair of built-in rechargeable Li-ion batteries which provide approximately 2 weeks of runtime. It can be used to measure the negative ion background value of indoor, indoor and outdoor air, as well as air negative ions produced by various negative ion fabrics, paints, panels, etc., as well as negative ion products for automobiles It has the characteristics of accurate measurement, high sensitivity, strong moisture resistance, and convenient use. The air ion charge conversion efficiency is high, the work is stable and reliable, and the reliability, stability and environmental adaptability of the test data are effectively improved., Manufacturer: XZXXZSZ