DESC: This non-contact voltage detector can be used for residential, commercial and industrial applications. Equipped with a super-bright worklight, 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 worklight to each tool.