Amprobe AMB-3 Insulation Resistance Tester

  • Tests insulation of wires, cables, transformers and electrical motors
  • Battery powered
  • Helps cut unscheduled downtime and reduce shock hazards
  • Built in voltmeter
  • Battery OK test
  • Mirror scale
  • Automatic discharge of equipment capacitance for safe removal of test leads


Cut unscheduled downtime and reduce shock hazards with the Amprobe AMB-3. Quickly check the insulation resistance value of electric equipment and lines with this small, easy to operate tester.



Insulation resistance with 250 V DC test voltage 0 O → 50 MO
Insulation resistance with 500 V DC test voltage 0 O → 100 MO 0 O → 1000 MO
Voltmeter 0 V → 600 V ac/dc 0 → 600 V ac
Low resistance (300 mV DC) 0 O → 100 O


What’s Included

  • AMB-3
  • Test leads
  • Carrying case
  • Batteries (installed)


Datasheet »
Product Manual »

3 reviews for Amprobe AMB-3 Insulation Resistance Tester

  1. danny

    best product on the market. job well done

    I had other competitors products but this is the only meter I was able to get a good reading and stable. Very easy to use and read I would recomend this to any one new to the field or like me more advanced. I thought it would be to big to carry around but the size is perfect the display is ideal to see in all lighting. Big plus when cramp up next to a motor checking for ground wires

    ✔ Yes, I recommend this product.

  2. DEGDaco

    Awsome Megger

    We do industrial installations on airfields. We use these handy testers to check insulation resistance on wires we install. This tools lets us know if a wire has been nicked or damaged and will leak voltage once energized. Saves us some headaches with dim lights.
    This little device can save lives to. Just resently we installed 500mcm copper service wires. Before we energized the wires we Megger the wires with this tester and it showed one leg shorting to ground. We removed the wire and sure enough the cable was nicked and touching the metal conduit. Could have been an arc flash situation.
    I prefer the analog tester over the digital because I can watch the needle move as it charges the wire and drop down again. When you use a digital one it just spits a number out and it’s hard to tell if you have a loose test lead.
    It’s durable to. I’ve dropped it several times and it always works and passes our yearly calibrations test. Defiantly a must tool for any electrician or industrial maintenance person.

    ✔ Yes, I recommend this product.

  3. TommyT

    This a great insulation tester for the price!

    I use this insulation tester (megger) all the time to troubleshoot ground faults on pieces of equipment and to verify there are no ground faults on new equipment before commissioning it. This tester will identify ground faults that can not be found with just a simple ohm test to ground with a standard multimeter because it charges the conductor with 500 vdc to check for leakage to ground.

    ✔ Yes, I recommend this product.

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