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Megger MIT320 Insulation and Continuity Tester

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£399.54 £332.95
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The Megger MIT320 is the second-highest specification model available in Megger's MIT300 series and is the upgraded version of the MIT300, MIT310 and MIT310A.

A powerful, handheld and easy to use insulation and continuity tester, the Megger MIT320 is made tough for use on site, with rubber armoured casing and rigid display cover which locks down to protect the tester when not in use.

Megger's MIT320 can perform insulation tests with test voltages of 250, 500 and 1000V with maximum testing range of up to 999MΩ. Testing procedures can be activated directly from the tester, or alternatively you can use the switched probe supplied with the MIT320 to activate the tests remotely. For added convenience, continuity testing will automatically activate when connected to the circuit.

The main exclusive additions which are added to this unit compared to other MIT300 units include an insulation limit alarm (from 0.01MΩ to 999MΩ), adjustable continuity buzzer (1 to 20Ω) with the ability to disable and the ability to carry out resistance measurements from 10Ω to 1MΩ.

Megger's MIT300 series is built with safety in mind - this insulation tester includes a number of protective safety measures including a Safety Interlock which will prevent unsafe test lead connection, safe contact detectors which will protect the tester even if the MIT is connected to live circuits when on continuity setting and even a safety lockout which will prevent the test from operating if voltage is above 50V.

Megger MIT320 Insulation and Continuity Tester Key Features

  • Insulation testing at 250, 500 and 1000V with test range of up to 999MΩ
  • Insulation limit alarm with range from 0.01MΩ to 999MΩ
  • Continuity testing to 100Ω with buzzer (adjustable from 1 to 20Ω - can be disabled)
  • Lead null to 9Ω
  • Voltage measurements to 600V (AC/DC)
  • Resistance measurements from 10Ω to 1MΩ
  • Backlit LCD display for use in poor lighting conditions
  • Locking test button for continuous testing
  • Automatic power off
  • Switched test probe allows tests to be remotely activated without actually touching the meter
  • IP54 weatherproof design
  • Suitable for use with rechargeable batteries
  • Rigid display cover folds over the unit to protect it during transportation
  • Colour-coded ranges make it easier to select the test you want
  • Hangs comfortably around the neck for hands-free use
  • Automatic continuity test activattion when connected to a circuit
  • Safety interlock prevents unsafe test lead connection
  • Safety lockout prevents the test from operating if voltages above 50V are detected
  • Meets and exceeds the standards of the UK/International Wiring regulations including BS7671, VDE 0413 Parts 1 and 4, HD 384, IEC 364, NFC15-100, NEN3140, ES59005 and EN 61557
  • Includes 3 year warranty from Megger

What's Included?

  • Megger MIT320 Insulation and Continuity Tester
  • Test Leads Set with Crocodile Clips (1002-001)
  • SP4F Switched Probe (6220-809)

Optional Accessories

  • 1002-015 Fused Test Lead Set

Megger MIT300 Series Differences

ModelMIT300MIT310MIT310A AnalogueMIT320MIT330
Insulation Testing          
1000V -
Test Range 999MΩ 999MΩ 999MΩ 999MΩ 999MΩ
Insulation Limit Alarm (0.01MΩ to 999MΩ) - - -
Continuity Testing          
Continuity to 100Ω
Continuity Buzzer
Lead Null to 9Ω 0.5Ω
Adjustable Buzzer (1 to 20Ω) - - -
Audible Buzzer Disable - - -
Voltage Measurement          
Volts AC/DC - 600V 600V 600V 600V
Resistance Measurement          
10Ω to 1MΩ Range - - -
Voltage Warning - - - -
Default Voltmeter -
Backlit Display - - -
Backlit Selector Ranges - - -
Locking Test Button
Auto Powerdown -
Switched Test Probe - - -
IP54 Weatherproof
Accepts Rechargeable Batteries
1000 Test Result Storage - - - -
Downloading - - - -


Please find below a selection of accessories available for the Megger MIT320 Insulation and Continuity Tester. For further information, please contact our sales team. 

Our SKU Megger's Part Number Product
MEGITA1 1002-001B Unfused Lead Set, Red/Black (Boxed)
1000-562 1000-562 Test Lead Probe Cap [Clear] Bag of 20
MEGRCDA4 1002-015B Fused Test Lead Set Red/Black Red FF500mA 50kA (Boxed) 
1002-491 1002-491B Prod & Clip Set - Insulation Testers
SP4F 1007-156 SP4F Remote Switched Probe
6121-561 6121-561 Fuse Set 5x500mA(F) 600V  
1004-610 1004-610 Lead USB Type A to Type B 1.8m 
1007-003 1007-003 Blow Moulded Case Catch - Pack of 10  
Accessories related to this product:
  1. Megger 1007-156 SP4F Remote Switched Probe
    £64.80 £54.00
  2. Megger Standard Test Leads
    £31.75 £26.46
  3. Megger 1004-610 Data/ Printer 1.8m Lead - USB Type-A to Type-B
    £9.90 £8.25
  4. Megger Fused Test Leads (Red/Black)
    £63.00 £52.50
  5. Megger 1007-003 Blow Moulded Case Catch
    £14.40 £12.00
  6. Megger Clear Probe Caps for MFT 1500 Series - Bag of 20
    £20.70 £17.25
  7. Megger 6121-561 Fuse Set
    Megger 6121-561 Fuse Set
    Lead Time: 1-2 Weeks
    £16.80 £14.00
  8. Megger 1002-491 Probe & Clip Set for Megger's Insulation Testers
    £30.60 £25.50
Part CodeMIT320-EN

Megger MIT300 Series Technical Specifications

Nominal Test Voltage MIT310, 310A, 320, 330: 1000V, 500V, 250V (DC)
MIT300: 500V, 250V (DC)
Measuring Range 10kΩ to 999MΩ on all ranges
Short Circuit Current 1.5mA nominal
Test Current on Load 1mA at min. pass values of insulation (as specified in BS7671, HD 384 and IEC 364)
Accuracy (at 20°C) MIT300, 310, 320, 330: ±3% ± 2 digits up to 10MΩ, ±5% up to 100MΩ, ±30% up to full scale
MIT310A: <2.5% of scale length (or 30% of reading 200kΩ to 10MΩ)
Measuring Range 0.01Ω to 99.9Ω (0-50Ω on analogue scale)
Open Circuit Voltage 5V ± 1V
Short Circuit Current MIT300, 310, 320, 330: 205mA + 10mA -5mA
MIT310A: 200-250mA
Continuity Accuracy MIT300, 310, 320, 330: ±3% ± 2 digits
MIT310A: ±2.5% of scale length (or 30% of reading 0.2 to 2kΩ)
Measuring Range 0-2/20/200/2kΩ
Open Circuit Voltage 1.5V ± 0.5V
Zero Offset Adjust MIT300, 310, 320, 330: 0 - 9Ω
MIT310A: 0 to 0.5Ω
Continuity Buzzer MIT300, 310: operates at <5Ω
MIT 320, 330: adjustable from 1Ω to 20Ω
MIT310A: operates at <5Ω
MIT300, 310, 320, 330: response time <20ms
MIT310: response time <100ms
Resistance Range (MIT320/330)  
Measuring Range 10Ω to 1MΩ
Open Circuit Voltage 5V
Short Circuit Current 1.5mA
Accuracy (at 20°C) ±5 ± 2 digits up to 100kΩ
Measuring Range (MIT310A) 0 to 2kΩ (refer to continuity)
Voltage Range  
Measuring Range 0 to 600V AC (50/60Hz) or DC
Accuracy (at 20°C) MIT310, 320, 330: DC or AC (50/60Hz): ±1% ± 2 digits
MIT310A: ±2.5% of scale length for 50/60Hz
Temperature Coefficient <0.1°C per °C on all ranges
Default Voltmeter  
MIT310, 320, 330 >25V AC or DC is applied display will operate as a voltmeter
MIT300 Beeps and flashes V on the display
MIT310A All modes including OFF
Test Inhibit If more than 50V is detected testing will be inhibited
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