Amprobe AD40B Mini-Clamp Ammeter

(6 customer reviews)

  • Low-cost, miniature digital ammeter
  • 400 A AC range
  • Maximum jaw opening: 25.4 mm
  • 4000-count display with bargraph
  • Autoranging
  • Data hold
  • Auto-off
  • 3 3⁄4 digit LCD (max reading 3999)
  • Over-range indication: “OL indicated


The Amprobe AD40B Ammeter won’t take much space in your tool kit and offers quick and accurate measurements.


AC Voltage 400.0 V, 600 V
DC Voltage 400.0 V, 600 V
AC Current 40.00 A, 400.0 A
DC Current
Resistance 400 O
Accommodates conductors Up to 1.0 (25 mm) in diameter
AC Current range: 40 A, 400 A
Accuracy: ± (2 % rdg + 10 dgts)
Resolution: 0.01 A in 40 A range
Overload protection: 660 A for AC current


What’s Included

  • AD40B
  • Carrying case
  • Battery (installed)


Datasheet »
Product Manual »

6 reviews for Amprobe AD40B Mini-Clamp Ammeter

  1. btaylor

    graet basic tool

    basic , easy , quick only one meter needed only 1 tool needed

    ✔ Yes, I recommend this product.

  2. Rmarlow1

    Love this Amprobe!!!

    I have been doping service work for a long time and over the years have used many different brands of meters and ammeters.
    I got this mini version since I usually work on wiring that allows this unit to operate. I have had large units that are too big and buklky. This one is perfect for my application.

    ✔ Yes, I recommend this product.

  3. Stan

    A great little meter for use in the Home

    The clampon feature is great for measuring AC currents.

    If you want to measure DC currents the inline wire method provides the way

    ✔ Yes, I recommend this product.

  4. Skye98

    Size Doesn’t Matter

    This is an absolutely GREAT instrument. Just the right size yet packed with all the right features

    ✔ Yes, I recommend this product.

  5. handydugg

    Quick & easy to use, a HUGE time-saver

    I used this amprobe at a local community college, and it was a huge time saver and handy tool to make instant readings on current and voltage in a small motor. We used it a great deal to learn about electric motors. I don’t even need one in the near future and bought one anyways just in case, since the price was great too. Can’t wait to find a reason to use it again. Great tool!

    ✔ Yes, I recommend this product.

  6. Mbknight

    Fantastic Tool

    I been in the automotive field 25+ years this tool is just the right size for checking current draws and how much amperage a motor or pump is pulling.

    ✔ Yes, I recommend this product.

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