High Voltage Probe 40,000 Volts Max DC, 28,000 Volts Max AC (50/60 Hz)40,000 volts max DC 28,000 volts max AC (50 60 Hz) 1,000M input impedance Accuracy DC: 1% to 20KV, 2% to 40KV. Accuracy AC: 5% to 10% (1~28KV ; 50 60Hz). Output Division: 1V 1KV Before taking any measurements, first connect the alligator clip of this probe to earth ground and make sure connection is electrically good. Full Specifications: Input impedance: 1000M Max. Operation Voltage: DC: 0 ~ 40KV, AC: 1 ~ 28KV ( 50 60 Hz ) Polarity: Positive Negative