insulation resistance tester; megohmmeter
A measuring instrument used to test the insulation resistance of electrical equipment and wiring. Also called a megohmmeter or 'megger' (brand name).
Before electrical work, we check the insulation of the wiring with an insulation resistance tester.
Refers to the insulation resistance itself, while 絶縁抵抗計 is the instrument that measures it.
Common brand-derived term for an insulation resistance tester, often used informally in the field.
Compound of 絶縁 (insulation), 抵抗 (resistance), and 計 (meter). A straightforward technical term.