Extech Insulation Testers
Insulation degradation is a leading cause of electrical failure, motor burnout, and facility downtime. Testing the integrity of wire, motor windings, and transformer insulation is essential for predictive maintenance and preventing catastrophic electrical shorts. Extech’s insulation testers (megohmmeters) provide a wide range of high-voltage diagnostic capabilities. From highly portable 1000V handheld meters for everyday electrical contracting to advanced 10kV industrial testers for utility-scale infrastructure, Extech equips professionals with the rugged, reliable tools needed to ensure long-term electrical safety.
Handheld Digital Insulation Testers (Up to 1kV)
Compact, autoranging megohmmeters designed for everyday testing of standard electrical motors, wiring installations, and switchgear.
MG310 Compact Digital Insulation Tester: A highly portable tester that measures insulation resistance up to 1000V. It features automated Polarization Index (PI) and Dielectric Absorption Ratio (DAR) calculations for deep diagnostic insights into insulation health over time.
MG320 True RMS Insulation Tester/Multimeter: The ultimate hybrid tool. Seamlessly combines a fully functional 1000V digital insulation tester with a True RMS multimeter, allowing technicians to carry one single meter for both standard electrical troubleshooting and advanced megohmmeter diagnostics.
380260 Autoranging Digital Megohmmeter: A classic, reliable 1000V autoranging tester featuring a large backlit LCD display with an analog bargraph. Includes a continuity function, AC voltage measurement, and a test hold feature for hands-free operation.
High-Voltage Industrial Megohmmeters (5kV to 10kV)
Heavy-duty testers built into rugged field cases, engineered specifically for high-capacity power distribution, heavy machinery, and utility transformers.
MG500 High Voltage Insulation Tester (10kV): A powerhouse industrial tester capable of generating programmable test voltages up to 10kV. Designed for extreme applications, it measures up to 500GΩ and features automated PI/DAR calculations, customizable test times, and data logging capabilities for comprehensive maintenance reporting.
380396 Digital High Voltage Megohmmeter (220V): Designed specifically for industrial environments operating on 220V mains power. Generates adjustable test voltages up to 5kV and measures insulation resistance up to 60GΩ. Includes auto-discharge capabilities for safe operation and a rugged, weather-resistant carrying case.
380320 Analog High Voltage Megohmmeter: A highly durable, field-ready tester for technicians who prefer the visual tracking of an analog display. Delivers test voltages up to 5kV and measures resistance up to 400GΩ. Built directly into a heavy-duty, water-resistant field case with a live circuit warning indicator.