Klein Tools offers two voltage testers that use standard replaceable test leads for added convenience. The ET60 voltage tester requires no batteries as it measures AC/DC voltage up to 600V in electrical circuits, outlets, light fixtures and anywhere else AC/DC voltage testing is required. The ET250 voltage and continuity tester incorporates an LCD display, measures AC/DC voltage up to 600V and can test GFCI protected circuits. Both testers are rated CAT IV 600V for safety.