NHS & School Discounts Available: Please call for more information.

Extech MG320 Insulation Multimeter

Be the first to review this product

  • Insulation resistance measurement up to 20GΩ with 50V to 1000V test voltage
  • Multimeter functions such AC/DC voltage, resistance, and continuity testing
  • Save up to 99 readings alongside custom test configurations

rrp £273.17

now £221.00 (Ex. VAT) £265.20 (Inc. VAT)

rrp £273.17

Please select a free gift below.

  • Description

    Extech MG320 Insulation Multimeter

    The Extech MG320 Insulation Multimeter is a versatile instrument capable of measuring a wide range of different electrical variables with a particular focus on insulation resistance. It has an insulation resistance range of 0 to 20GΩ with test voltages between 50V and 1000V. It has a basic accuracy of ±3% and a maximum resolution of 0.01MΩ.

    In terms of multimeter functions, the Extech MG320 can measure AC/DC voltage between 0 and 600V and resistance between 0 and 20kΩ. It has true RMS correction for AC values and there is a continuity test function whilst insulation testing benefits from PI/DAR modes, step voltage and a programmable timer.

    The Extech MG320 has an internal memory for up to 99 readings and has a comparator for custom test configurations and quick results. It is easy to select the measurement function and test voltage using the simple dial and other features can be accessed via the push buttons.

    Readings are shown on the Extech MG320’s backlit digital display that has a data hold function and dynamic bar graph for fluctuating readings. The insulation multimeter has a Cat IV 600V safety category rating and it comes supplied with test leads, a crocodile clip, batteries, and soft case. It is covered by a one-year warranty.

    Extech part number: MG320

    Key Features

    • Insulation range: 0 to 20GΩ
    • Test voltages: 50V, 100V, 250V, 500V, 1000V
    • PI/DAR modes
    • Step voltage testing
    • AC/DC voltage range: 600V
    • True RMS for AC readings
    • Resistance range: 0 to 20kΩ
    • Continuity testing
    • Internal memory for up to 99 readings
    • Cat IV 600V safety rating
    • One-year warranty
  • Specification

    Insulation Resistance

    • Ranges: 50MΩ, 100MΩ, 200MΩ, 500MΩ, 2000MΩ, 1GΩ, 10GΩ, 20GΩ
    • Resolution: 0.01MΩ
    • Accuracy: ±3%
    • Test voltages: 50V, 100V, 250V, 500V, 1000V
    • Test voltage accuracy: 0 to 10%

    AC/DC Voltage

    • Range: 600V
    • Resolution: 0.1V
    • Accuracy: ±2%


    • Range: 20kΩ
    • Resolution: 0.01Ω
    • Accuracy: ±1.5%
    • Continuity: Yes
    • Dimensions/Weight: 8.9 x 4.1 x 2.3" (225 x 103 x 59mm)/ 1.5lbs (0.7kg)
  • Supplied Accessories

    • Extech MG320 Insulation Multimeter
    • Test leads
    • Crocodile clip
    • 6 x AA batteries
    • Soft case
    • Instructions for Extech MG320
  • Product Questions

    Please Sign in or Create an account to post a question.

    There are no entries.

  • Reviews

    There are currently no reviews for this product. If you have previously purchased it please leave a review using our quick and easy form to the right.

    Write Your Own Review

    Only registered users can write reviews. Please, log in or register

  • Delivery Information

    At Test-Meter.co.uk we understand the importance of a reliable delivery service when shopping online. Especially when the goods are often essential to your working day. If your goods are required by a certain date please feel free to contact us for an honest and realistic indication whether this can be met. We aim to process all orders we receive within 1 to 3 working days, however from time to time we do have an increased demand for certain products or there might be delays from the manufacturer. In such cases delivery of your equipment may be subject to a minor delay.

    We use DPD/Interlink for all larger items and Royal Mail for smaller items and accessories. With DPD/Interlink you will receive a 1 hour delivery window on the day of delivery via e-mail/text and a notification 15 minutes before arrival so you will not have to wait around all day. You can even manage your booking online and re-arrange delivery for another date or arrange the goods to be left with a neighbour of your choice.

    We also offer delivery options for goods required urgently on certain products, all which are sent by DPD/Interlink.

    Our charges for UK deliveries:

    • FREE Delivery (on select products only): typically 3-5 working days*
    • Standard Delivery at £4.95: 2-3 working days
    • Next Working Day Delivery (on select products only) at £7.50
    • Pre-Noon Next Working Day Delivery (on select products only) at £9.50*
    • Pre-10.30am Next Working Day Delivery (on select products only) at £18.50*
    • Saturday Pre-Noon Delivery (on select products only) at £14.50*
    • Sunday Pre-Noon Delivery (on select products only) at £14.50*

    *UK mainland only

    NOTE! For next working day or Saturday/Sunday delivery options the order MUST be placed no later than 3pm on the working day before delivery is required. After 3pm, please arrange with our staff before selecting a priority delivery service. Priority services are available to UK mainland residents only (this might exclude certain areas in the north of Scotland).

    Customers outside the UK:

    Test-Meter.co.uk exports to many countries all over the world. Prices for shipping vary on location and weight/dimensions. Costs are calculated for certain countries at the checkout. If your country is not included in this list please e-mail admin@test-meter.co.uk with your name, address and the items you would like to order for an accurate shipping quote or go to http://www.test-meter.co.uk/test-equipment-export for more information.

    For more information on delivery, please see our terms and conditions.