MCM Electronics

Handheld 8MHz Oscilloscope w/Digital Multimeter DMMMCM Part #: 72-8400  |  Tenma Part #: 72-8400

Handheld 8MHz Oscilloscope w/Digital Multimeter DMM 3.9 stars from 6 reviews.
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Combination 8MHz Oscilloscope/DMM
Compact handheld unit provides outstanding DMM performance plus added functions of a single channel oscilloscope.

Set Includes:

  • USB cable
  • Data logging software
  • Test leads
  • Alligator clip adaptors
  • AC adaptor
  • Requires (4) “AA” batteries, not included

    Click Here for the latest updated software version.

  • Product Description


  • 3999 count display
  • Voltage, current, resistance, capacitance and frequency measurement
  • 10MΩ input impedance
  • Continuity buzzer
  • Diode test


  • 8MHz bandwidth
  • 40MS/s sample rate
  • 160 x 160 pixel monochrome display
  • Normal, free run and single shot trigger modes
  • 10 screen and setup memory


  • USB interface
  • Backlit display with adjustable brightness and contrast
  • Sleep mode
  • Low battery indicator

    Device software can be downloaded here: 72-8400 Software (.zip, 2.2Mb)

    Specifications Range Best Accuracy
    DC Voltage 400mV, 4V, 40V, 400V, 1000V±(0.8% +8)
    AC Voltage4V, 40V, 400V, 750V±(1% +15)
    DC Current 400µA, 4000µA, 40mA, 400mA, 4A, 10A±(1% +8)
    AC Current 400µA, 4000µA, 40mA, 400mA, 4A, 10A±(1.5% +8)
    Resistance400Ω, 4KΩ, 40KΩ, 400KΩ, 4MΩ, 40MΩ±(1% +5)
    Capacitance40nF, 400nF, 4µF, 40µF, 100µF±(3% +8)
    Frequency10Hz ~ 10MHz±(0.1% +3)
    Vertical accuracy blank ±(5% +1)
    Input sensitivity20mV/div ~ 500V/div blank
    Horizontal accuracy blank ±(0.01% +1)
    Timebase range100ns/div ~ 5s/div blank
    Sample rate40MS/s (real time) blank
    Duty cycle0.1% ~ 99.9% blank
    Dimensions1.9" (H) x 3.9" (W) x 7.9" (D) blank

  • Product Reviews

    • "Convenient Combination of DMM and Basic Scope and Logging" by olduffer on 6/12/2013
      Overall: 3.5 out of 5

      This is a cost-effective combination of DMM and basic oscilloscope and measurement logging functions. The controls are pretty intuitive and didn't take long to learn. The software that came with it just plain wouldn't work on a couple of my PCs, be sure to get the version 3 download instead. It's a bit thicker than I'd like and the carrying case could be better. Its worst aspect is poor display contrast.

    • "Pretty good for the money." by swades on 7/28/2011
      Overall: 4.5 out of 5

      This meter functions well and accurately. They need to work on their translation though. The following is an actual excerpt from the computer interface software manual. "If what to use is multimeter the USB provide with the form connect a people's line, the USB pick up a people line of red unauthorized biography lose the line to receive to carry to insert multimeter fix in the slot with a back of the form protection, then go on-line of another on carry with computer of string a right conjunction is then." I haven't got a clue what it means....

    • "What the...." by amurph1111 on 6/28/2011
      Overall: 3.5 out of 5

      It is incredibly frustrating to say the least when you waste two hours of your life trying to find the software for this unit online. You come to MCM's page, and you see a download link. Finally, you think, you've found it. But the link never works! Besides that, I have no complaints about the unit in particular, just complaining about the lack of something as simple as an online software download... MCM, if you see this, I would really appreciate if you could follow up on this!

    • "Disapointed with operation" by jsword on 6/13/2011
      Overall: 2.5 out of 5

      While I agree with the two other reviewers on this scope-meter it has a serious technical flaw in that the scope function is not truly AC coupled and it is not possible to make millivolt measurement of AC ripple voltage on the output of a power supply or voltage buss as you would with a regular oscilloscope.

    • "Affordable Scope-Meter" by CircuitRider on 3/25/2010
      Overall: 5 out of 5

      The Tenma 72-8400 - Hand-held 8MHz Oscilloscope w/Digital Multimeter DMM is one of the most versatile meters I have owned. It allows quick and accurate DC readings while observing any noise on the power supply lines. I recently was troubleshooting a distortion problem in a digital organ and almost immediately found a noisy square wave clock pulse. This is now my main DMM on any job.

    • "pretty darn good for the money" by spider250 on 11/6/2008
      Overall: 4.5 out of 5

      I would not say this is the most sophisticated scope I have used, but for the money, you wont find anything that comes close. In fact, I would say you wont find anything close for near double the price. The manual is good, but if you have any experience using a scope, you wont need it. The controls are intuitive enough to take this out of the box and use. Display quality, overall solid feel, nice case, good accuracy, what else can I say. This is a great find.

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    Package Specifications & Dimensions
    Weight:3.1 lbs.
    Warranty:365 days
    Need to Return?
    Length:11.5 in.
    Width:9.25 in.
    Height:2.5 in.
    Shipping Information
    Extra Shipping Charge:No
    Drop Ship:No
    Catalog Pages

    MCM Cat 57, Page 1252

    MCM Cat 56, Page 1087

    PDF Reference

    Requires Adobe Acrobat Reader.

    Mfr. Info

    Tenma Logo
    Mfr. Name:Tenma
    Mfr. Part Number:72-8400
    Save at least 15% on all Tenma Test Equipment through Sunday. Use promo code EMC396.
    Save at least 15% on all Tenma Test Equipment through Sunday. Use promo code EMC396.