The Fluke 80K-40 High Voltage AC/DC Probe, 40,000V AC/DC is designed to extend the voltage measuring capability of an AC/DC voltmeter to 40,000 volts (peak AC, or DC Overvoltage Category I). This probe can only be used to make measurements on energy limited circuits within equipment, such as televisions or photo copy machines. The probe provides high accuracy when used with a voltmeter having 10 Megohm input impedance. Note: Do NOT use this probe to measure high voltages on power distribution systems.