Application: For use in hazardous areas and for the detection and location of live conductors, cable breaks, blown fuses, single-strand detection Before starting an electrical installation, electricians must ensure that the working environment is voltage-free. A voltage tester is required to test alternating electric fields or detect suspected sources of error. The non-contact Wiha voltage tester gives you an initial indication as to whether there is no voltage thanks to an optical and acoustic signal. After switching on the permanently green lit LED indicates the operational readiness. During voltage testing, the LEDs light up, depending on the strength of the alternating electric field, from blue (weak) to orange to red (strong). Two AAA batteries are required for use, which are included in the delivery. If the device is not used for 4 minutes, it switches off automatically in order to save energy. A built-in LED torch enables measurement points to be lit in dark conditions and can b