Non-contact voltage detector for residential, commercial, and industrial applications. The Milwaukee 2201-20 comes equipped with a work light 3x brighter than the competition. Rated at CAT III 600-Volt, it has a range of 90-to-600-Volt. It is sensitive enough to indicate which side of an outlet is live. Designed for Milwaukee's proprietary accessory mount rail system, it mounts easily onto Milwaukee's DMM (2217) and Laser Temp-Gun (2266) to add voltage detection and a work light to each tool. Nothing but HEAVY DUTY.