Professional Electrostatic Tester: non-contact electrostatic qualitative testing gauge for quickly detecting the surface static of the object.Mini Palm Size: easy to operate by single hand, convenient to carry around.Three Indicator Light: green for power, red for positive charge and blue for negative charge.Power Supply: powered by 2pcs CR2030 battery, low power consumption.Wide Applications: it is widely used in the measurement of static electricity on the surface of masks, non-woven fabrics, plastics, films, rubber, fiber composite plates and other products.Working Temperature: 0~50Sensing Range: 100V~20KVMeasuring Distance: 10mm (optimal)Respond Time: 1~3sMeasuring Method: Handheld non-contact measurementPower Supply: 2 * CR2030 battery(Not Included)Item Size: 80 x 60 x 25mm / 3.15 x 2.36 x 0.98inItem Weight: 58g / 2.05ozColour: blackMaterial: plasticPackage Contents:1 x Electrostatic DetectorOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.