Features: Mini Tester, Multi-function, Insulation, Electricity Testing. Multi-function insulated tester screwdriver pen, ideal for home use. You can use it to test AC voltages directly or indirectly, you can also use it as a flathead screwdriver. Handheld electrical tester, an ideal partner for electricians. Portable cross-head screwdriver pen with voltage detector. Suitable for use at home, shop, garage, car, motorcycle, boat, snowmobile. Working voltage: AC 100-500V.