Working in cramped electrical boxes and trying to find a safe metallic contact points is often challenging. The Fluke T6-600 Electrical Tester with FieldSense™ technology, lets you quickly and safely take measurements by sliding the open fork over a conductor, without the need for test leads. The T6-600 works with wires up to AWG 4/0 (120 mm2) with a 17.8 mm jaw opening