DMM-BLE-2x01A “Mooshimeter” Technical Specifications:

Document History:

  1. 2013/12/27: Initial Release
  2. 2014/01/07: Moved accuracy note to beginning of document.  Corrected input impedance in high precision voltage.
  3. 2014/01/13: Added summary graphic at beginning of document.
  4. 2015/09/23: Removed note about calibration procedures.
  5. 2017/04/25: Added note about AUX input impedance applying only in the listed measurement range.
  6. 2018/07/09: Added link to code examples




  • Up to 600V, DC or peak AC
  • Up to 420VAC RMS sinusoidal
  • Better than 0.5% accuracy DC
  • Better than 1.0% accuracy AC for harmonic content below 1kHz
  • >10 Megaohm input impedance

High Precision Voltage:

  • Up to 100mV with <15nV per count resolution
  • Up to 1.2V with <200nV per count resolution
  • >10 Megaohm input impedance
    • If used outside of the measurement range (0-1.2V), the overvoltage protection circuit will short this to the common (“C”) input.

Current, Internal

  • Up to 10 Amps
  • 20 µV / mA burden voltage (using factory fuse)
  • Less than 5 µA per count in 10 Amp scale
  • Better than 1% accuracy


  • Better than 1% accuracy over 20 Ohms –  20 Megaohms


  • Better than 1% accuracy up to 1kHz


  • Up to 1V @ 100nA


  • 8kHz dual simultaneous sampling
  • 4kHz analog bandwidth for most measurements
  • 24-bit resolution max
  • >18 Effective bits at 125 samples per second

On Board Storage – SD Card

  • MicroSD Card
  • Up to 32GB
    • More than a week of constant logging two channels at 8kHz
  • SD or SDHC (not SDXC)


Protocol: Bluetooth Low Energy

GATT Profile: Code examples for how to interact with the Mooshimeter can be found on our Github page.

Wireless Range

The wireless range has been tested empirically through the following media to an iPhone 5.

  • 50m air, line of sight
  • 5cm of refrigerator, door closed
  • Engine compartment to the passenger seat of most vehicles
  • 10m air + safety shield of a Tesla Coil rock-bands testing facility



Simultaneous high-speed sampling of voltage and current gives the following power measurements:

  • True Power
  • Reactive, Complex, Apparent Power
  • Power Factor
  • Total Harmonic Distortion
  • Phase Lead or Lag


Measure the supply sag under load to estimate:

  • Supply or Battery equivalent resistance
  • Battery State of Health

Current Measurement, External Shunt

  • Measure thousands of amps with sub-milliohm shunts
  • Measure precision currents with large shunts
  • Use the existing wiring for “quick’n’dirty” measurements
    • Use 1′ of 10AWG for 12µA per count resolution, up to several times the wires ampacity.


  • External Thermistors
    • Steinhart-Hart or Beta parameterized
  • External Thermocouples
  • Internal ambient temperature sensor