The Milwaukee non-contact voltage detector can be used for residential, commercial and industrial applications. Equipped with a work light 2X brighter than the competition, the 2201-20 is sensitive enough to indicate which side of an outlet is live. Rated at CAT III 600V, it has a range of 90 to 600 volts. The 2201-20 was designed for Milwaukee’s proprietary accessory mount rail system and mounts easily onto Milwaukee’s DMM (2217) and Laser Temp-Gun (2266) to add voltage detection and a work light to each tool. Work Light is two times brighter than the competition, allows you to work in the darkest work areas Designed and Safe to work in Industrial Applications. Industry leading non-contact voltage detection technology. Runs off easy to replace AAA battery . Extra bright light allows tool to double as mini-flashlight. Slides on test and measurement tools to increase utility. Easy to use rear push button design. Scan for AC Electrical Yes Non-Contact Voltage Yes LED Work Light Yes Indication Visual Switch Type On/Off .