HEAT INSULATION Features: Tests insulation of wires, cables, transformers and electrical motors The test voltage is obtained by means of a hand cranked, constant voltage generator Does not require batteries or any external power supply, always ready for use Sensitive Ohmmeter for checking resistance of motor windings Guard terminal eliminates effect of any surface leakage that may influence readings Light and smooth operating crank Rugged cross coil movement High impact housing Spring loaded terminal connection Limited Life Time Warranty Test insulation of wires, cables, transformers and electrical motors without batteries or external power. With the Amprobe AMC-3 Insulation Tester, this hand cranked tool is always ready to test. Includes: Test Leads Carrying Case Specifications: Insulation resistance with 500VDC test voltage:  0-100M? ±5% Rdg @ (0.1 - 50M?) ±10% Rdg @ > 50M? Insulation resistance with 1000VDC test voltage: 0-500M? ±5% Rdg @ (0.1 - 00M?) ±10% Rdg @ > 200M? Low resistance:  N/A UPC/DCI: 11808 Size: 7.00x8.75x11.00 inch Weight:  4.25 lb