Amprobe AMB-45 [2731024]  Insulation Resistance Tester. The Amprobe AMB-45 insulation resistance tester tests the insulation of wires, cables, transformers and electrical motors. With selectable test voltages up to 1000 V and a rugged, durable design, the AMB45 is both fast and easy-to-use. The Amprobe AMB-45 comes complete with test leads and PC software where data can be downloaded. The AMB45 also has a programmable timer to perform the dielectric absorption ratio test, sensitive ohmmeter for checking resistance of motor windings and a built in voltmeter. The AMB-45 is both fast and easy to use.