UEi Test Instruments IRT3 Analog Insulation Resistance Tester Includes: Test Leads, Fuse, Alligator Clips, Hard Caring Case, Manual AC Voltage Measurement: 0 - 600V (40 - 1kHz Frequency) 3 Insulation resistance ranges: 0 - 50M, 0 - 100M, 0 - 400M Continuity: 0 - 50 Tested to IEC100 Safety Requirements