Insulation resistance measurements in four ranges up to 4000 Megaohms with 1 kiloohm resolution and ±3.0% basic accuracy are achieved with Model 380365 insulation tester. It can collect data via an RS-232 interface and Windows-compatible data acquisition software and can also measures up to 600 vac. Measurements are displayed on a 4000-count backlit LCD with data hold and 50-segment analog display capabilities. And low resistance, audible continuity, automatic zero, and other test functions make the unit useful for regulatory compliance, appliance safety, and wire and cable testing.