Intelligent Waterproof Voltage Tester Pen Voltage Z8K8
With self checking function to know whether the pen works on or not. Pen clip design, size and weight for easy carrying. : 3 LR41, 1.5V, 25mAh. Screwdriver size: 17 4mm / 0.7 0.2in. Item length: 155mm / 6.1in.