Extech MG500 Digital High Voltage Insulation Tester

The MG500 is designed for professionals who need to perform reliable high-voltage insulation testing in industrial or utility environments. It supports adjustable test voltages from 500 V up to 10 kV, selectable in 500 V increments or via preset buttons (1 kV, 2.5 kV, 5 kV, 10 kV). Its auto-ranging capability allows the device to measure insulation from as low as 800 kΩ up to 500 GΩ with a resolution of 1 kΩ.

To assist with aging and insulation condition assessments, the MG500 includes Polarization Index (PI) and Dielectric Absorption Ratio (DAR) modes. These help evaluate how insulation resistance changes over time under sustained voltage. The unit also offers a memory function to store and recall readings, along with a digital display for clear readouts.

For safety and usability, the MG500 meets safety ratings (e.g. CAT III 300 V) suitable for many applications. It is built into a robust housing, often used with heavy-duty leads, and is suited to both laboratory and field environments. Typical dimensions and weight make it portable enough for site use.

Features

• High Test Voltage Capability — Selectable up to 10 kV DC.
• Wide Resistance Measurement Range — From about 0.8 MΩ (800 kΩ) to 500 GΩ.
• Preset Voltage Keys — Quick selection of 1 kV, 2.5 kV, 5 kV, 10 kV.
• Polarization Index (PI) & DAR Modes — For assessing insulation condition over time.
• Auto-Ranging — Automatically selects the proper resistance range.
• Memory / Recall — Store and retrieve measurement data.
• Clear Digital Display — Provides readouts in relevant units with good legibility.
• Robust Build — Suitable for field use, durable housing and safe operation.
• Flexible Test Voltage Steps — Adjustable in 500 V increments for fine control.
• Safety Rating — Compatibility with typical high-voltage environments (e.g. CAT III).

Includes

• A year warranty
• Built-in heavy duty carrying case with cover
• Test leads, alligator clips
• 8 x C batteries