The Greenlee VWS-20 (52083997) Next Generation V-Watch Personal Voltage Detector with Carrying Bag detects the strong electric fields surrounding high voltage conductors and power distribution equipment. It is a small pocket size device worn on the outside of clothing or other protective gear by users who are operating near power lines or high voltage equipment. The detector provides an extra level of safety for personnel trained in the use and application of working on or near high voltage systems.

The V-Watch Personal Voltage Detector works by sensing the presence of the electric field surrounding anything that conducts high voltage electricity and sounding an alarm. It measures the strength of the electric field; a higher voltage or stronger field will cause the detector to alarm from a greater distance.

The V-Watch emits a series of loud beeps and flashing lights when an electric field is first detected. The beeps and flashing lights increase in frequency as the user approaches the source of the high voltage electric field. A steady alternating tone and flashing lights indicates very close proximity to high voltage and the need for extreme caution. This variable beeping rate helps the user to determine if they are approaching the high voltage source or moving away from it to safety.

The detector tests itself automatically each time it is opened. A successful self test is confirmed by a series of tones and flashing lights. A failed test is indicated by a solid error tone and no lights. A low battery alarm is a slow alternating tone and flashing red lights. The unit will shut off when it is closed and this is verified by descending tones.