Electrical tester with open jaw clamp 600v the fluke t5 electrical testers let you check voltage continuity ad current with one compact tool with the t5 all you have to do is select volts ohms or current and let the tester do the rest open jaw current lets you check current up to 100a without breaking the circuit its tough test leads stow neatly in the back of the tester making it easy to tote the t5 in your tool pouch detachable slim reach test probes are customised for national elec