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Megger MIT300 Insulation and Continuity Tester

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£322.80 £269.00
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The entry-level tester in Megger's MIT300 series, this insulation tester combines rugged, reliable portability with high accuracy testing procedures.

Suitable for use in domestic, commercial and industrial applications, the MIT300 is capable of testing insulation at 500V and 250V DCand also includes a built-in continuity testing function with integrated buzzer.

Megger's MIT300 is uniquely designed, with a built-in protective cover that fits over the screen and dials to protect it during transportation. It's also weatherproof to IP54, allowing limited use outdoors.

Megger MIT300 Insulation and Continuity Tester Key Features

  • Easy and safe to use
  • Digital and analogue LCD bar graph display
  • Megger Intelligent Safety System built in
  • 250V and 500V insulation testing
  • Test range of up to 999MΩ
  • Continuity testing to 100Ω to continuity buzzer
  • Voltage warning
  • Locking test button
  • Auto powerdown
  • IP54 weatherproofing
  • Accepts rechargeable batteries

Full List of Products Included

  • Megger MIT300 Insulation and Continuity Tester
  • Test Lead Set with Crocodile Clips


Please find below a selection of accessories available for the Megger MIT300 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
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  
MEGSW1 1000-631 Powersuite Lite - 17th Edition and PAT Certification Software
Accessories related to this product:
  1. Megger Fused Test Leads (Red/Black)
    £63.00 £52.50
  2. Megger 1007-003 Blow Moulded Case Catch
    £14.40 £12.00
  3. Megger Clear Probe Caps for MFT 1500 Series - Bag of 20
    £20.70 £17.25
  4. Megger 6121-561 Fuse Set
    Megger 6121-561 Fuse Set
    Lead Time: 1-2 Weeks
    £16.80 £14.00
  5. Megger 1002-491 Probe & Clip Set for Megger's Insulation Testers
    £30.60 £25.50
  6. Megger Standard Test Leads
    £31.75 £26.46
  7. Megger 1004-610 Data/ Printer 1.8m Lead - USB Type-A to Type-B
    £9.90 £8.25
Part CodeMIT300-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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