The 80K40 High Voltage Probe is a high voltage accessory probe designed to extend the voltage measuring capability of an ac/dc voltmeter up to 40,000 volts. In essence the probe is a precision 1000:1 voltage divider formed by two matched metal-film resistors. Range: 1 kV to 40 kV dc or peak ac, 28 kV rms ac. Input Resistance: 1000 Mohm.