For many years, electricians and technicians looking for a quick current reading have reached for the trusted Fluke T5 Electrical Tester, a personal everyday tool seen in tool belts the world over. With the T5, you slide the open fork around a conductor and safely measure ac current up to 100 amps. No need to clamp the fork shut or break the circuit. This “open fork” technology simply saves time and is safer to use than test leads. But the T5 still requires test leads to measure voltage.