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MIT400/2 Industrial Maintenance Insulation / Continuity Tester

The Megger MIT400 Industrial Maintenance Insulation & Continuity Tester is a convenient test instrument for those involved in electrical supply industry. A classic 2 wire low voltage insulation & continuity test instrument.

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Megger MIT400/2 Maintenance Insulation and Continuity Tester

Megger MIT400/2 Maintenance Insulation and Continuity Tester offers CATIV 600 V safety in a convenient easy to hold format.

It is a true diagnostic test instrument designed to measure insulation resistance, offering diagnostic tests which make it ideal for engineers working in industrial maintenance, allowing them to trend motor performance, and give more solid evidence when taking a motor out of service.

The MIT400 mk2 Insulation and Continuity Tester has been designed not just for Electrical and Industrial, but with an exceptionally wide range of applications from electrical installations, cable testing, motor testing, automotive, ESD, panel building, avionics, maintenance etc. Insulation testing has been enhanced with feedback controlled test voltages to limit over-voltage to 2%, rather than the industry standard 10-20%.

Continuity testing is now significantly faster, and a single auto-ranging 0.01 Ω to 1.0 MΩ function replaces the “Ohms” and “kOhms” ranges. Retained are the 200 mA and 20 mA test options.


What‘s NEW with the Megger MIT400 mK2 (1004-731)?

The updated mk2 now includes several new features detailed below including stabilised test voltage control and a redesigned case, back-stand, and 6 cell battery compartment with separate fuse access.  Over-moulded for increased protection to achieve an IP54 weatherproof rating.

  • NEW Stabilised insulation test voltage
  • NEW Single range, faster continuity testing from 0.01 Ω to 1 MΩ
  • NEW case design with optional magnetic hanging strap
  • NEW Test voltages 250 V, 500 V and 1000 
  • NEW Test voltage display
    • The actual test voltage is displayed on the smaller digital readout, with the measurement on the larger digital display.
  • NEW Continuity feature:
    • Single resistance range One range fully automatic from 0.01 Ω to 1.0 MΩ
  • NEW Display feature:
    • Setup functions allow control of Buzzer limit alarms, Continuity test currents


Other Megger MIT400 Key Features:

  • Insulation testing up to 1000 V and 200 GΩ range
  • 600 V Trms AC and DC voltage measurement
  • Live circuit detection and protection
  • CAT IV 600 V and IP54
  • 2% test voltage accuracy
    • The output test voltage is maintained within the tolerance or -0% +2%
  • Stabilised test voltage
    • The voltage is feedback controlled to ensure it remains within specification throughout the full test range
  • Analogue arc
    • The display also features an analogue arc to replicate the response of a moving coil display
  • Silicon leads
    • High quality flexible silicon test leads are comfortable to use and prevent measurement errors on GΩ ranges above 5 GΩ
  • Test inhibit
    • prevents testing if voltages in excess of 25 V, 30 V, 50 V,  75 V 100 V (set by the user) are detected when making insulation  tests (Default is 50 V)
  • Insulation buzzer
    • The buzzer can be set to buzz if the insulation resistance is  above a user adjustable limit, set in the Setup menu
  • Test Lock
    • Holds insulation test on continuously
  • Lead null
    • Lead resistance compensation (NULL) operates up to 10 Ω of resistance
  • Buzzer
    • ON/OFF selected by simple push button
  • Buzzer limit
    • Continuity buzzer limit alarm provides adjustment of the maximum resistance the continuity buzzer sounds. This is adjustable from 1 Ω to 200 Ω in 12 steps


What comes with the Megger MIT400/2?

  • Megger MIT400/2 Insulation Tester
  • Red/Black Silicone Test Leads with Probes + Clips
  • Owners Information CD
  • 6 x AA Alkaline Batteries
  • Hard Carrying Case


▶ Putting the MIT400 Through its paces!


▶ Getting started with the MIT400 Series:


The Megger MIT400 Series:

  • MIT400/2 (1004-731) 250 V, 500 V and 1000 V
  • MIT410/2 (1004-735) 50 V, 100 V, 250 V, 500 V and 1000 V + Polarisation Index, Dielectric Absorption Ratio
  • MIT420/2 (1004-739) 50 V, 100 V, 250 V, 500 V and 1000 V + Polarisation Index, Dielectric Absorption Ratio, Variable Test Voltage and result storage
  • MIT430/2 50 V, 100 V, 250 V, 500 V and 1000 V +Polarisation Index, Dielectric Absorption Ratio, Variable Test Voltage and Bluetooth download


Comparison Chart for: Megger MIT400/2 Industrial Maintenance Insulation / Continuity Tester

50 V / 100 V
250 V / 500 V / 1000 V
PI- / DAR / Timed
Lock button on MΩ
Leakage current display
Continuity 0.01 Ω - 1 MΩ
Auto reverse polarity (setup ON-OFF)
Lead null (< 10 Ω)
AC / DC Volts 600 V
mV AC / DC range
Frequency measurement 15 - 400 Hz
Input impedance 0.25 MΩ
Capacitance 0.1 nF - 10 μF
Other Features
PASS/FAIL on limit alarms
Auto power down (setup)
On board memory
Bluetooth download + software
Can use AA Alkaline or NiMH
On-board charging (optional charger)
CAT IV 600 V / CAT III 1000 V
Silicone leads (red/black)
Switched probe supplied
Optional battery charger available
The MIT Range
Voltage rangeUp to 1000 VUp to 1000 VUp to 1000 VUp to 500 V
Test Range1000 MΩ1000 MΩ200 GΩ100 GΩ
Voltage Measurement600 V600 V600 V
On board Memory
Rechargeable batteriesOnly available in MIT 485/2


Accessory Code Description Price (Ex VAT)
1000-562 Probe Cap [clear] bag of 20 £26.00 ADD
1002-001B Standard test leads (Red/Black) with prods and clips (NEW) right angle plugs £46.00 ADD
1007-157b Remote Switched probe SP5 CAT IV 600 (Boxed) £69.00 ADD
1007-160 Carry Pouch £62.00 ADD
1007-169 Blow Moulded Case MIT400 Series £24.00 ADD