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CAT # PM-120 (4 Reviews) Write a Review

$15.00 each
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Product Description
5 Vdc operation
Common Ground - Can monitor own voltage
0.56" figure height
Automatic Polarity Indication
Zero reading for 0 Volt input
Automatic Polarity Indication
High input impedance (>100M Ohm)

Maximum Input: 199.9mV DC (.1999 VDC)
Maximum Display: 3 1/2 digits with auto polarity indication
Measuring Method: Dual Slope Integration A-D converter system
Overrange Indication: "1" shown in display
Reading rate time: 2-3 readings per second
Input Impedance: >100M Ohm
Accuracy: 0.5%
Power Dissipation: 60mA DC
Supply Voltage: 5Vdc
Bezel: 2.75" x 1.26" x 0.25"
WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to
(This item was manufactured prior to August 31st, 2018)

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Customer Reviews (4 Reviews)

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Motorcycle voltmeter

Reviewer: from Cookeville TN

I bought this meter for my motorcycle and powered it via a 5V three terminal regulator. The meter worked fine, but could not be read in full daylight. Worked well on cloudy days or at night. I would suggest LCD as a much better way to go.

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Great simple meter


I needed to add a volt meter to my model rocket launcher to make sure I had enough power to ignite my high power rocket motors. This both looked and worked impressively. Great buy!

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PM-120 nee PM129B

Reviewer: from CHARLOTTE, NC US

I purchased a PM-120, but I received a PM-129B. I mounted it in a 4x2x1 plastic box and powered it with a 5VDC DC-DC regulator, which uses the source that I am monitoring. It works well. I would like to know how to dim the LED display, however. If anyone knows how to do that, would you please post a response?

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Works well

Reviewer: from York, PA USA

I use one to track the voltage of my 2000 Insight's NiMH pack (via isolating / voltage-reducing resistors), powered by a little 6-pack of 1.2V AAs via a small switch, and it works great, using little current. It seems to stay accurate as the power supply fades, dimming the LEDs in the process somewhat (down to maybe 50% before the low voltage causes issues). Try an adjustable regulator for some brightness control (don't go over 7V).

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