The Milwaukee voltage detector with LED is used for residential, commercial and industrial applications. The 2202-20 can detect between 50 and 1000 V AC and has an industry leading safety rating of cat IV 1000 V. with a built in bright LED work light, the 2202-20 is two tools in one. The durable tip allows for easy checking of power outlets. The 2202-20 is also designed with a green power on indicator light so you know the voltage detector is working properly before use.