dmm-tools

Read, record, and remote-control digital multimeters over USB. Supports UNI-T and Voltcraft meters — see supported devices.

Includes a CLI with text/CSV/JSON output and a GUI with real-time graphing.

CLI

• Live measurement streaming with text, CSV, and JSON output
• Coulomb counting / energy integration (--integrate)
• Remote control — send button presses over USB
• Guided protocol capture wizard for bug reports

$ dmm-cli read --count 5
9.090 MΩ [AUTO]
8.902 MΩ [AUTO]
10.182 MΩ [AUTO]
9.399 MΩ [AUTO]
9.176 MΩ [AUTO]

--- 5 samples | Min: 8.9020 | Max: 10.1820 | Avg: 9.3498

Output as JSON for scripting:

$ dmm-cli read --format json --count 1
{"display_raw":"  3.369","flags":{"auto_range":true,"dc":false,"hold":false,...},"mode":"DC V","range":"22V","unit":"V","value":3.369}

Send remote commands:

$ dmm-cli command hold
Sent hold

Connect to other device families with --device:

$ dmm-cli --device ut8803 capture
WARNING: UNI-T UT8803 support is EXPERIMENTAL (unverified against real hardware).

GUI

• Real-time value display and time-series graph with minimap
• Statistics, cursor measurements, reference lines with threshold triggers
• Live specifications (resolution, accuracy) for the current range
• Recording with CSV export and remote control buttons
• Big meter mode for bench-mount use

Supported devices

Family	Models	Status
UT61+/UT161	UT61E+, UT61B+, UT61D+, UT161B/D/E	✅ Verified (UT61E+; other models)
UT171	UT171A/B/C	🧪 Experimental
UT181A	UT181A	🧪 Experimental — partial hardware verification
UT803/UT804	UT803, UT804	🧪 Experimental (#15, #16)
UT8802	UT8802, UT8802N	🧪 Experimental
UT8803	UT8803, UT8803E	🧪 Experimental
VC-880/VC650BT	Voltcraft VC-880, VC650BT	🧪 Experimental
VC-890	Voltcraft VC-890	🧪 Experimental

🧪 = reverse-engineered from vendor software; most have not yet been tested on real hardware — click to help verify. UT181A has been partially verified on real hardware (init, framing, and VDC parsing); other modes still need testing.

See docs/supported-devices.md for the full compatibility list and reference implementations.

Quick start

Pre-built binaries for Linux, Windows, and macOS are available on the Releases page. Or install from source:

cargo install --git https://github.com/antoinecellerier/dmm-tools.git dmm-cli
cargo install --git https://github.com/antoinecellerier/dmm-tools.git dmm-gui

dmm-cli read            # stream measurements
dmm-gui                 # launch the GUI

See setup & troubleshooting for driver installation, udev rules, and platform-specific instructions.

Documentation

• CLI reference
• GUI reference
• Setup & troubleshooting
• Architecture
• Protocol details
• UX design
• Development guide
• Changelog

Contributing

See CONTRIBUTING.md for how to submit bug reports, protocol captures, and code changes.

License

GPL-3.0-or-later. See LICENSE for details.

References

• ljakob/unit_ut61eplus — Protocol reverse engineering and Python implementation
• mwuertinger/ut61ep — Protocol reverse engineering and Go implementation
• Silicon Labs AN434 — CP2110/4 HID-to-UART interface specification
• UT61B+/D+/E+ | User Manual - UNI-T user manual