The BESANTEK BST-HVD10 Safety Voltage Detector is designed to alert a user that he is approaching live equipment where dangerous voltage is present. The safety voltage detector helps the user stay a safe distance away from live equipment. It therefore protects and safeguards users from approaching dangerous live high voltage equipment or cables. The tool is designed for checking the presence of AC high voltages and low voltages. with voltage detection ranging from 100Vac to 69kVac.