Connect your OWON B41T+ multimeter over Bluetooth and get a live readout on your desktop — complete with measurement history, a trend chart, and hardware button controls. No drivers, no proprietary software.
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Discovers nearby BLE devices and highlights OWON-compatible ones. Filter toggle keeps the list clean. Tap once to connect. Large real-time display with measurement function (V DC/AC, A, Ω, Hz, F, °C, °F, Diode, Continuity, hFE, NCV, Duty Cycle), scale prefix, and unit. Visual indicators for HOLD, REL, AUTO, BAT, MIN, MAX, and OL (overload) — styled to match the physical display. |
On-screen buttons mirror the physical multimeter: Animated line graph of recent measurements with glow effect, grid lines, and min/max labels. Scrollable timestamped log of every reading. Auto-scrolls to new entries unless you've scrolled up — resume with the play button. Live Min / Average / Max statistics panel updated with every new reading. |
| Platform | Minimum Version |
|---|---|
| macOS | 10.15 Catalina |
| Windows | Windows 10 |
| Linux | Ubuntu 20.04+ (BlueZ required) |
Bluetooth must be enabled. On Linux, the
bluetoothservice must be running (sudo systemctl start bluetooth).
Download the latest release for your platform from the Releases page.
| Platform | File |
|---|---|
| macOS | multimeter-gui-macos.zip → unzip → drag to Applications |
| Windows | multimeter-gui-windows.zip → unzip → run multimeter_gui.exe |
| Linux | multimeter-gui-linux.tar.gz → extract → run ./bundle/multimeter_gui |
macOS note: The app is unsigned. On first launch go to System Settings → Privacy & Security and click Open Anyway.
# Prerequisites: Flutter 3.11+, platform toolchain (Xcode / VS / GCC)
git clone https://github.com/your-username/owon.git
cd owon
flutter pub get
# Pick your platform:
flutter build macos --release
flutter build windows --release
flutter build linux --releaseLinux also needs:
sudo apt-get install libgtk-3-dev libbluez-dev libdbus-1-devThe app communicates with the multimeter over BLE using these characteristics:
| Role | UUID | Direction |
|---|---|---|
| Service | 0xFFF0 |
— |
| Measurements | 0xFFF4 |
Notify (6 bytes per reading) |
| Button commands | 0xFFF3 |
Write |
| Device rename | 0xFFF1 |
Write |
| Action | macOS | Windows / Linux |
|---|---|---|
| Zoom in | ⌘ = |
Ctrl = |
| Zoom out | ⌘ - |
Ctrl - |
| Reset zoom | ⌘ 0 |
Ctrl 0 |
 | #00FF88 | Green — live readings, active states |
 | #00C8FF | Cyan — secondary accent, AC mode, controls |
 | #FFCC00 | Yellow — HOLD / REL flags, average stat |
 | #FF6600 | Orange — BAT flag, max stat |
 | #FF4444 | Red — overload, errors |
 | #0D0D0D | Background — main surface |
MIT © Luis Santos
This project is not affiliated with, endorsed by, or in any way associated with OWON Technology Inc. or any of its subsidiaries. OWON and B41T+ are trademarks or registered trademarks of their respective owners. All product names, logos, and brands are property of their respective owners and are used here for identification purposes only.