• 121GW Multimeter

    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

    SKU: 121GW Category: Tag:


    User Manual

    121GW Manual


    121GW EEVBlog Circuit diagram



    UEi’s App
    EEVblog’s App


    EEVblog’s UWP App


    EEVblog App’s GIT


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







    BLE Packet Format

    121GW BLE Packet Format V1

    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


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