ORI(10F) Insulation resistance tester I. Pro duct introduction The ORI (10F) Insulation Resistance Tester – also known as a megohmmeter, high-voltage megohmmeter, or high-voltage insulation resistance tester – is commonly used for insulation resistance testing in laboratory or field settings. This instrument features a dual-layer housing and integrates a 5.6-inch color LCD screen for displaying test results. It comes with a bilingual (Chinese/English) operating interface and