Megger MIT400/2 Insulation and Continuity Tester

The Megger MIT400/2 is a handheld insulation and continuity tester designed for use across electrical, industrial, automotive, and avionics applications. As part of the MIT400/2 series, it offers selectable test voltages of 250V, 500V, and 1000V, enabling insulation resistance measurements up to 200 GΩ. The tester also supports continuity testing from 0.01 Ω to 10 MΩ and AC/DC voltage measurements up to 600V. Safety is prioritized with CAT IV 600V and IP54 ratings and live circuit detection The MIT400/2 includes leads and a redesigned rugged case with a six-cell battery compartment. It runs on standard AA or rechargeable NiMH batteries and is engineered for high accuracy and reliability in demanding environments.

Features and Benefits

• Adjustable insulation test voltage of 250 V, 500 V and 1000 V

• 600 V Trms AC and DC voltage measurement

• Insulation testing up to 1000 V and 200 GΩ range

• Stabilized insulation test voltage

• Single range, faster continuity testing from 0.01 Ω to 1 MΩ

• New case design with optional magnetic hanging strap

• Live circuit detection and protection

• CAT IV 600 V and IP54 weatherproof rating

• Designed for Electrical and Industrial testing

Insulation Testing

Diagnostic insulation testing begins with a simple “spot test”—applying voltage and measuring resistance. While this provides basic insights, comparing results over time is key. Regular testing helps track aging, identify issues, and prevent failures or costly downtime.

Continuity - The Opposite of Insulation

With a continuity test, you’re looking to make sure that your circuit is isolated, and all of the connections are continuous. With the MIT400/2 tester, continuity testing is now fully automatic from 0.01 ohms to 1 MΩ with fast contact detection while continuously protecting against accidental contact with live circuits. The tester features a “buzzer” function, which sounds a tone when continuity is achieved.

Wind and Solar Applications

The MIT400/2 series has demonstrated reliable performance within the renewable energy sector (when paired with a PV test lead kit). These testers have been effectively applied in both wind and solar systems, covering components such as generators, cabling, and combiner boxes. With the Megger MIT400/2 insulation testers, you can detect pinched wires and leakage issues early—before they pose serious risks.

MIT400/2 Series CAT IV Insulation Testers

The MIT400/2 Series replaces the original MIT400 instruments and introduces a redesigned case, back stand, and six-cell battery compartments with dedicated fuse access. All four models feature over-molded construction for enhanced durability and carry an IP54 weatherproof rating. Additionally, continuity testing is now much faster, thanks to a single auto-ranging function covering 0.01 Ω to 1.0 MΩ, which replaces the previous 'ohms' and 'kOhms' ranges. The 200 mA and 20 mA test options remain available.

What's in the Box

• MIT 400/2 Insulation Tester

• Silicone leads (red/black)

• Batteries 6 x AA Alkaline

• Carry case

• Calibration certificate

Questions and Answers

• What are the application uses for the MIT400/2 Series?
  The MIT400/2 series of insulation testers are perfect for industrial maintenance and utility applications. They are CAT IV rated, allowing for instrument connection outside the building, have a higher energy available under fault condition and are defined by IEC61010.

• Why should you use an insulation tester and measure for insulation resistance?
  Insulation resistance (IR) measures the quality of your insulation and provides an overall assessment of your electrical equipment’s health. The top five reasons to use an insulation tester are that it helps extend the life of your equipment, saves money by preventing unexpected failures, is quick and easy—usually taking about one minute—won’t damage your equipment or reduce its lifespan, and there is a tester available for every budget, measurement range, and voltage requirement.

• What tests can be performed with a MIT400/2 tester?
  The Megger MIT400/2 insulation tester can perform insulation resistance testing, continuity testing, resistance measurement and voltage measurement. However, the MIT400/2 series of insulation testers includes three other models which include DAR and PI diagnostic functions.

• Does the MIT400/2 have storage or Bluetooth for data transfer?
  No, it does not. If storage or wireless is preferred, the Megger MIT430/2 insulation tester provides greater than 1,000 test results storage capacitance measurement and Bluetooth pairing. Test results can be downloaded to a CSV file which can then be opened as an Excel spreadsheet.