Amprobe AMB-25 Digital Insulation Resistance Tester Insulation resistance meter to test insulation of wires, cables, transformers, and electrical motors Digital meter with automatic range selection Internal memory stores up to 9 test results Measures insulation resistance from 0 to 1,000 megaohms with 250, 500, and 1,000V DC test voltage Safety rated to European Standard EN 61010-1 Category III 1,000V Tests insulation of wires, cables, transformers and electrical motors Selectable test voltages 250V, 500V and 1000V Programmable timer to perform the dielectric absorption ratio test Sensitive ohmmeter for checking resistance of motor windings