Feature: 1. Professional Electrostatic Tester: non-contact electrostatic qualitative testing gauge for quickly detecting the surface static of the object. 2. Mini Palm Size: easy to operate by single hand, convenient to carry around. 3. Three Indicator Light: green for power, red for positive charge and blue for negative charge. 4. Power Supply: powered by 2pcs CR2030 battery, low power consumption. 5. 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. Specification: This electrostatic detector can be used in the qualitative measurement of whether there is static electricity on the surface of the target object. 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. Features: 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. Specifications: Material: ABS Working Temperature: 0~50 Sensing Range: 100V~20KV Measuring Distance: 10mm (optimal) Respond Time: 1~3s Measuring Method: Handheld non-contact measurement Power Supply: 2 * CR2030 battery Item Size: 80 * 60 * 25mm / 3.15 * 2.36 * 0.98in Item Weight: 58g / 2.05oz Package Weight: 92g / 3.24oz Package Size: 11 * 8.3 * 4.4cm / 4.33 * 3.27 * 1.73in Packing List: 1 * Electrostatic Detector 1 * Manual (English) Package List: 1 * Electrostatic Detector 1 * Manual (English)