Built-in test lead holder on back of voltage tester holds the leads in one of two positions - one so that they are spaced correctly to test tamper-resistant US-style outlets and the other for convenient storage of the test leads|Batteries not required, voltage tester is powered by the applied voltage|Voltage tester is rated CATIII 350 V, class 2, double insulation and has IP44 ingress protection|Receptacle tester detects the most common wiring problems in standard and GFCI receptacles|Works on GFI outlets and confirms operation of the ground fault protective device