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Extech MG325 Insulation Tester/True RMS MultiMeter
Extech MG325 True RMS MultiMeter/Insulation Tester
Extech MG325
Price: $499.99

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Availability: Subject to availability
Product Code: MG325


Extech MG325 Insulation Tester/True RMS MultiMeter

The Extech MG325 Insulation Tester/True RMS MultiMeter is a great dual-purpose tool for working with electrical conductors. With its primary role being an insulation tester, it includes many functions to assist in the evaluation of electrical insulation integrity. However, the MG325 also includes most of the functionality of a normal multimeter making it a versatile tool with many abilities.

Test insulation with voltages as high as 1000 volts and resistance measurements of up to 200 GΩ. Use the built-in Polarization Index, Dielectric Absorption Ratio, and Step Voltage tests to aid with insulation evaluations. The adjustable Pass/Fail option offered by the Comparison Mode allows the user to obtain quick feedback with measurements.

In addition to testing insulation, it also includes many capabilities of a regular multimeter. Take DC or true-RMS AC voltage readings of up to 600 volts. The MG325 can also test for continuity, measure capacitance, and read resistances as high as 10 MΩ. With its onboard memory, as many as 99 different readings can be stored and recalled at a later point in time reducing the need of recording measurements on paper.


  • Insulation resistance up to 200 GΩ
  • Polarization Index (PI) and Dielectric Absorption Ratio (DAR) measurements
  • Programmable Timer feature sets the duration of test
  • Low Resistance measurement with Zero function
  • Comparison Mode with user-adjustable Pass/Fail values for insulation and continuity measurements
  • Step Voltage (10% steps at 50% to 120% of range)
  • Auto-discharge of voltage test signal
  • Lock Power On Function for hands-free operation
  • Manually store/recall up to 99 readings
  • Backlit 10,000 count display with analog bargraph
  • LED high voltage and LCD overload indication
  • Data Hold, Auto Power Off and Low battery indication


  • Extech 325 Insulation Tester/True RMS Multimeter
  • Remote probe
  • Test leads
  • Alligator clip
  • 6 x AA batteries
  • Soft case

Warranty Information

The Extech MG325 Insulation Tester/True RMS MultiMeter carries a 1-year warranty.

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