• Welcome to Lyssos Enterprises!
  • +30 210 7106060
  • 6-8, Efklias Str, Piraeus, 185 38, Greece

Extech MG325: CAT IV Insulation Tester/True RMS MultiMeter


Insulation Tester/DMM with Datalogging

Combines a 200GΩ/1000V high range Insulation Tester with a full-featured True RMS MultiMeter in a single, compact instrument. CAT IV safety rating ensures the highest level of protection.



  • Test Voltages of 250V, 500V, and 1000V
  • Measure Insulation Resistance to 5.5GOhm (autoranging)
  • AC Voltage measurement from 30 to 600V
  • Polarization Index measurement (PI)
  • Dielectric Absorption Ratio measurement (DAR)
  • 10MOhm internal resistance test
  • Low Resistance measurement with Zero function
  • Continuity beeper
  • Large 2000 count dual display with backlight
  • High voltage and overload indication
  • Auto-discharge and voltage output warning functions
  • Low battery indication
  • Complete with test leads, alligator clips, 6 AA batteries, hard cover, and soft carrying case


Specifications Range Resolution Basic Accuracy
Insulation Resistance 50MΩ, 100MΩ, 200MΩ,500MΩ, 2000MΩ, 1GΩ, 10GΩ, 20GΩ, 50GΩ, 100GΩ, 200GΩ 0.001MΩ ±(3%+3d)
Insulation Test Voltages 50V, 100V, 250V, 500V, 1000V _ 0 to 20%
AC/DC Voltage 600V 0.01V AC: ±(1.5%+5d)/ DC: ±(2%+3d)
Leakage Current 2000µA 10µA ±(10%+3d)
Resistance 10MΩ 0.01kΩ ±(3%+3d)
Low Resistance 100Ω 0.01Ω ±(1.5%+5d)
Capacitance 500µF 0.1nF ±(5%+5d)
Frequency 1kHZ 0.1HZ ±(0.1%+3d)
Continuity (audible) Yes
Dimensions/ Weight 8.9 x 4.1 x 2.3″ (225 x 103 x 59mm)/ 1.5lbs (0.7kg)


MG325 English Datasheet

MG325 English User’s Manual

MG325 CE Declaration of Conformity