121GW Multimeter

Rated 5.00 out of 5 based on 1 customer rating
(1 customer review)

AU$300.00 ex GST

A unique, feature packed Multimeter which has been developed with electronics designers and hobbyists in mind.
This multimeter represents two years of collaboration between EEVblog and UEI.

Out of stock


Designed for electronics use, with unique features such as:

  • Bluetooth connectivity (multi-device capability)
  • Open Source Cross Platform application software (Android + Windows, and more soon)
  • 15V Diode Test Voltage (useful for Zeners + LED strings etc)
  • VA Power measurement
  • Low Burden™ voltage
  • Unique burden voltage display
  • Micro SD Card data logging + firmware updating

Other major features include:

  • Dual 50,000 count display with bargraph
  • 0.05% + 5 Basic DCV Accuracy
  • Auto-Hold measurement
  • 600V CAT-III with independent UL 61010 certification by ETL
  • Safe operation through HRC fuse + TVS + PTC + MOV + Diode Bridge protection

Hardware Features:

  • AD8436 >100KHz True RMS
  • 4 x AA battery powered with 500+ hr battery life
  • Compact design – 84 × 165 × 59 mm (W × L × H)
  • Hackable ST ARM Cortex M3 processor (S-LINK/V2 programmer interface inside)
  • Hycon HY3131 chipset
  • MAX4238 Low Offset Amplifier for current ranges
  • SD Card firmware update
  • Full Open Schematic available
  • 8ppm ADR3412 voltage reference

The meter is manufactured by UEI Test Instruments, a reputable US based designer and manufacturer of high quality test gear. The design work was primarily done by UEI, but with a great deal of design input and direction from Dave. The meter is manufactured in South Korea.

Additional information

Weight 0.75 kg
Dimensions 22 x 15 x 10 cm


Manual Circuit diagram


Note: When upgrading a multimeter the “.bin” file must be renamed “EEVBlog.bin”:

EEVBlog1_22 EEVBlog1_21 EEVBlog1_17 EEVBlog1_15 EEVBlog1_10 EEVBlog1_07 EEVBlog1_05 EEVBlog1_04 EEVBlog1_02 EEVBlog1_00


UEi’s Android App
Android App
Windows App



BLE Packet Format

121GW BLE Packet Format V1

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1 review for 121GW Multimeter

  1. Rated 5 out of 5



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