Pro'skit 9SD-329H 125-250V Electrical Test Pen Portable Voltage Tester Induced Electric Pen Detector Screwdriver Hand Tools 9SD-329H diameter 3.5*190mmHave better quality and pass CE, VDE and GS certification to ensure product safetyLightweight design for fast detection (AC) DCThe surface of 40Cr alloy steel is nickel-plated and is designed with one-piece screwdriverLong product life and sturdiness