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Can source voltage into devices with both low and high input impedances many proving units cannot source into low impedance Sources DC as well as the normal AC Stable fixed output voltage means you can test Multimeters Clamp-Multimeters Voltage Testers and 2-pole Testers Long battery life-up to 5000 verification tests Fluke PRV240 Proving Unit. Small battery-powered. Validate the functionality of test tools without placing yourself in a hazardous electrical environment.