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Extech MG302: 13 Function Wireless True RMS MultiMeter/Insulation Tester

MultiMeter/1000V Insulation Tester with Wireless PC interface (433MHz)

The MG302 is a true RMS multimeter with a built-in insulation resistance tester and the added safety of wireless data streaming for remote monitoring and data recording. By adding insulation testing capabilities to this CAT IV-rated digital multimeter, electrical troubleshooters will always be equipped for insulation testing, helping to make it a more routine part of predictive maintenance with faster troubleshooting and repairs without the need for additional tools. The rugged and waterproof (IP67-rated) combination meter includes a digital insulation resistance tester (or megohmmeter) with four different test voltages for measuring resistance up to 4GΩ with 0.001MΩ resolution. The full-function, true RMS digital multimeter includes useful extras, like duty cycle measurements and milliamp readings for analog 4-20mA current loops in industrial analog process controls. The MG302 also has built-in wireless data recording for safer troubleshooting and maintenance on moving equipment, one-person operation of remote safety switches, and the ability to monitor real-time readings on a laptop or computer screen from safe distances — up to 30 feet away — to detect intermittent anomalies. The MG302 comes with a remote USB receiver, Windows compatible software, test leads with alligator clips, Type K bead wire temperature probe with adapter, carrying case, six AA batteries, and user manual.



  • Wireless USB interface transmits measurement data to a PC
  • Backlit super large triple display
  • 125V, 250V, 500V, and 1000V test voltages
  • Insulation Resistance from 0.001MOhm to 4000MOhm
  • Auto discharge of capacitive voltage
  • Lock Power On Function for hands-free operation
  • Data Hold, Min/Max, Relative mode, Auto power off
  • Complete with USB receiver, Windows® software, test leads & alligator clips, bead wire temperature probe, carrying case and batteries
  • USA, Mexico, and Canada use 915MHz model MG300 and majority of other countries use 433MHz model MG302


Specifications Range Resolution Basic Accuracy
Insulation Resistance 4MΩ, 40MΩ, 400MΩ, 4000MΩ 0.001MΩ ±3%
Insulation Test Voltages 125V, 250V, 500V, 1000V
AC/DC Voltage 1000V 0.1mVAC/ 0.01mVDC AC: ±1%, DC: ±0.06%
AC/DC Current 10A 0.1µA AC/ 0.01µA DC AC: ±1.5%, DC: ±1%
Resistance 40MΩ 0.01Ω ±0.3%
Capacitance 40mF 0.001nF ±3.5%
Frequency 100MHZ 0.001HZ ±0.1%
Duty Cycle 0.1 to 99.9% 0.01 ±1.2%
Temperature -58 to 2192°F (-50 to 1200°C) 0.1°F (0.1°C) ±1% + 4.5°F (2.5°C)
4-20mA% -25 to 125% 0.01%
Continuity/Diode Yes
Dimensions/ Weight 7.8 x 3.6 x 1.9″ (200 x 92 x 50mm)/ 20.5oz (582g)


MG302_English Datasheet

MG302_English User’s Manual

MG302_CE Declaration of Conformity