The Fieldpiece Digital Megohm Meter, model SMG5, is a compact standalone meter designed for checking HVAC compressor insulation. The SMG5 provides a 1000V voltage source, monitors current, and displays the resistance between the test points. Maximum current output is <1mA. It can be used to determine the condition of insulation from winding to ground in a motor, compressor, or transformer. Includes a case, alligator clip lead tip and leads with removable tips. Features & Benefits: Predict compressor failure.1000VDC stresses insulation to measure up to 2000Mohms.Backlit LCD display.Auto-off to extend battery life.Case, alligator clip, leads with removable tips.Includes: Megohm Meter “ SMG5(2) Probe tips(1) Ground lead with detachable tip (1) Alligator probe tipCarrying Case(4) 1.5V(AAA) batteries (installed)Operator's manual