Extech CAT IV Insulation Tester Multimeter PC Interface MG300

In stock

The CAT IV Insulation Tester Multimeter combines two great instruments into one. With True RMS accuracy and up to 1000V test voltages. CAT IV rating ensures safe usage on many jobs.

Extech CAT IV Insulation Tester Multimeter PC Interface MG300

The perfect combination of a 1000V insulation tester with a True RMS Multimeter and the ability to wirelessly send information to your PC


  • Wireless USB interface transmits measurement data straight to your PC
  • Large, Backlit triple display makes for quick and easy referencing
  • Waterproof (IP67) rugged housing design
  • 125V, 250V, 500V and 1000V test voltages
  • Insulation resistance from 0.001MΩ to 4000MΩ
  • CAT IV rating ensures safe usage
  • Auto discharge of capacitive voltage
  • Lock Power On function for hands-free operation
  • Data Hold and Auto power off
  • Min/Max and relative mode
  • 1 Year Warranty
  • Comes complete with remote receiver with USB cable, Windows compatible software, heavy duty 4-wire test leads, protective rubber holster, multimeter test leads, carrying case and 6 x AA batteries

The Insulation Tester True RMS multimeter combines highly accurate voltage, current, capacitance and frequency testing with an Insulation Tester. Its great for measuring the insulation resistance of transformer windings or across circuit boards. A multimeter is an indispensible tool for anybody working on electronic devices or with electricity as they include features such as the ability to measure voltage and current in both direct currents(DC) and alternating currents(AC). This multimeter also features the added ability to test the resistance, capacitance and frequency.

The True RMS multimeter gives accurate readings of distorted waveforms which would otherwise be averaged out in a more inaccurate way. The wireless PC interface means you can test and record the data straight to your personal computer without missing a step. Form data into a chart or analyze individual points.

(Note: USA, Mexico and Canada use 915MHz model MG300 and majority of other countries use the 433MHz model MG302)


  • Insulation Resistance: 4MΩ, 40MΩ, 400MΩ, 4000MΩ 0.001MΩ
  • Insulation Test Voltages: 125V, 250V, 500V, 1000V
  • AC Voltage: 1000V
  • DC Voltage: 1000V
  • AC Current: 10A
  • DC Current: 10A
  • Resistance: 40MΩ
  • Capacitance: 40mF
  • Frequency: 100MHZ
  • Duty Cycle: 0.1 to 99.9%
  • Temperature: -58 to 2192°F -50 to 1200°C
  • 4-20mA%: -25 to 125%
  • Continuity/Diode: Yes
  • Power source: 6 x AA batteries
  • Dimensions: 7.8 x 3.6 x 1.9” (200 x 92 x 50mm)
  • Weight: 20.5oz (582g)

Unit Ship Weight: 2 lbs

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