Fluke PRV240 Proving Unit PRV240 reduces the risk of shock and arc flash by validating the functionality of test tools without placing yourself in a potentially hazardous electrical environment Sources both ac and dc steady-state voltage - supplies 240 V dc/ac A single LED indicates functionality, making this unit a simple-to-use solution for verification of your test tool Compatible with both high impedance or low impedance multimeters, clamp meters or two pole testers Voltage is sourced through recessed contacts that are activated when tested probes are inserted to avoid accidental contact