Wiha Single-pole, non-contact voltage tester volt detector, explosion protectedSingle pole, non contact voltage tester volt detector, explosion protected 12 1,000 V AC 44309 Prior to the start of electrical installations, electricians must ensure that the work environment is voltage free. A voltage tester is needed for testing alternating electrical fields or detecting potential error sources. Thanks to its optical and acoustic signal, the non contact Wiha voltage tester indicates whether or not there is any voltage. After