Palm-size Electrostatic Detector, Portable Electrostatic Tester, Electrostatic Analyzer, 100V~20KV ESD Test Meter Gauge Feature: 1. Professional Electrostatic Tester: Non-contact electrostatic qualitative testing gauge for quickly detecting surface static on objects. 2. Mini Palm Size: Easy to operate with one hand and convenient to carry. 3. Three Indicator Lights: Green indicates power, red indicates positive charge, and blue indicates negative charge. 4. Power Supply: Powered by 2 CR2030 batteries with low power consumption. 5. Wide Applications: Suitable for measuring static electricity on the surface of masks, non-woven fabrics, plastics, films, rubber, fiber composite plates, and other materials. Specifications: - Material: ABS - Working Temperature: 0°C to 50°C - Sensing Range: 100V to 20kV - Measuring Distance: 10mm (optimal) - Response Time: 1 to 3 seconds - Measuring Method: Handheld non-contact measurement - Power Supply: 2 x CR2030 battery - Item Size: 80 x 60 x 25mm / 3.15 x 2.36 x 0.98in - Item Weight: 58g / 2.05oz - Package Weight: 92g / 3.24oz - Package Size: 11 x 8.3 x 4.4cm / 4.33 x 3.27 x 1.73in Package List: 1 x Electrostatic Detector 1 x Manual (English)