First, the instrument description: Professional helmet for detecting withstand voltage performance, mainly used in electrical type helmet manufacturers and the electricity sector. Second, the detailed parameters: ● LED digital display current, voltage regulator ●: Range 1500V, within 1min voltage increases to 1200V ± 25V, holding 15s ● current represents error ± 1%; voltage indicates error ± 1%; timing Indication for error ± 1% ● probe diameter 4mm, top hemispherical ● sink ● Equipped with high quality plastic system three test methods with a special test head ● meet the standards required in three standard GB / T 2812-2006 "security cap test method ", GB / T 2811-2007" helmet. "