Amprobe AMB-50 Industrial High-Voltage Insulation Tester Insulation resistance meter with built-in voltmeter to test insulation of wires, cables, transformers, surge arresters, generators, and electrical motors Digital meter with automatic range selection Internal memory stores up to 18 measurements for later download to PC using USB Measures voltage from 30 to 600V AC or DC and insulation resistance from 0 to 1 teraohm with 500, 1,000, 2,500, and 5,000V DC test voltage Safety rated to European Standard EN 61010-1 Category III 600V