Fluke® PRV240 Proving Unit provides safe method for 3-point test before touch (TBT) verification of electrical test tools without placing electrician or technician in potentially hazardous electrical environments generally involving known live voltage sources. Use reduces risk of shock and arc flash and does not require personal protective equipment. Able to source 240 V of AC and DC steady-state voltage, unit can perform up to 5,000 tests per set of 4 AA batteries.