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Mini Power Meter with Voltage, Current, Watts, mAh & mWh Display


Elmwood Electronics has stopped accepting orders. This product might be available at PiShop.ca. Please check this blog post about our recent team merger.

This Mini Power Meter with Voltage, Current, Watts, mAh & mWh Display (whew that is a mouth-full) is a lot like the USB In-Line Voltage and Current Meter we carry but can  be used with a wide range of voltages (not just USB connections). Measure the working voltage and current output for any project with this really fancy power meter.

This power meter has a small LCD display that shows off voltage, watts, amps, and mAH and instantly reads the numbers out for testing devices, such as chargers, cables, and cell phones. There are a few nice extras in this very fancy monitor, such as showing the impedance of the connected device as well as calculating the cumulative Watt-hours and milliAmp-hours over a running time. Basically it's an all-in-one power management solution that doesn't require any calculation or data logging on your part.

You can have it self-power from the power source it's measuring (it has a quiescent of about 20mA and requires at least 3V), or you can power separately from a JST connector or power-only micro USB socket.

Comes with

  • 1 x 2-pin JST Connector
  • 1 x NTC Temperature Sensor

Technical Details

Revision History:

  • As of June 23, 2020, this power mini kit no longer comes with positive and negative alligator clips, but now includes an NTC temperature sensor.


  • Input/output interface: 20 A large current screw terminal
  • Voltage range: 0.00 V ~ 150 V
    Resolution precision: 0.05 V
  • Current range: 0.00A ~ 20.0 A
    Resolution precision: 0.05A
  • Capacity range: 0 ~ 999.999 Ah
    Resolution precision: 0.01 Ah
  • Power cumulative range: 0 ~ 99999.9 Wh
    Resolution precision: 0.01 Wh
  • Power range: 000.00 ~ 2999.99 W
    Resolution precision: 0.01 W
  • Impedance range: 1 ~ 999.9 ohm
    Resolution precision: 0.1 ohm
  • Temperature range: 0 ~ 99 C
    Resolution precision: 1 degree C
  • Timing maximum time: 999 H 59 M 59 S
    Resolution precision: 1S
  • Small current standby alert threshold parameters: < 2W / 0.5 H
  • Small voltage power supply requirements: measuring < 5V
  • When voltage within range of 4 ~ 30V DC sensor is self-powering
  • For low voltage measurements, please supply independent power supply interface
  • Measurement rate: 0.5 times per second
  • Over-voltage over-current set the alarm mode: display warning interface
    to alert users
  • Over-voltage alert set range: 1 ~ 300V
    Under-voltage alert set range: 0 ~ 149V
  • Current alert set range: 0.2 ~ 100A
  • Product size: 48mm x 29mm x 22 mm
  • Quiescent current: < 20 mA
  • Working temperature: -10 ~ + 60 degrees Celsius
  • Working humidity: 10 ~ 80 % RH
  • Working pressure: 80 ~ 106 kPa

Product Dimensions: 47.5mm x 28.5mm x 26.8mm / 1.9" x 1.1" x 1.1"

Product Weight: 18.5g / 0.7oz