First, the instrument uses a professional anti-static requirements for testing of helmets, plastic, and helmets and other anti-static properties. Second, the instrument has to carry and use presentation ● lightweight, broad range, accurate readings, shock resistance and other advantages ● measuring range: 1 × 104Ω ~ 2 × 1010 Ω; Indication error: ± 1% ● has over-range prompts: more than the upper limit Tips and below the lower limit alarm ● Test voltage: 100V DC ● free to choose AC or DC (battery) Third, in line with standard GB / T 2812-2006 "helmet test method", GB / T 2811-2007 "security Hat "