A level start.
A simpler setup.

Set up your sensor

1. Mount on a known-level trailer. Park and secure the vehicle first. Fix the sensor rigidly and identify which way its logo and power button face relative to the hitch.
2. Connect. Power on your Leveller. In My devices, allow Bluetooth access, choose Find my Leveller and connect to your sensor. Android 8–11 also ask for the location permission required for Bluetooth discovery; the app does not track location.
3. Calibrate mounting. Follow the setup prompts while the known-level trailer and sensor remain completely still. Wait for confirmation from the sensor. A moving or unlevel reference is not a valid levelling calibration.
4. Save measurements. Enter length, width and sensor offsets as measured along the trailer body, using the reference layout shown in the app. Wait for the sensor to confirm the save.
5. Level manually. Use the live readings while operating your own levelling equipment. The app provides guidance; it does not move jacks or control the vehicle.

Four ways to see your level

Guide shows direction cues and reference heights where your saved dimensions apply. The points describe the app's rectangular reference layout; they do not establish actual jack positions or jack travel.

Bubble plots total upright tilt from 0° at the centre to 90° at the rim. Two axes separates front/rear and side tilt. Trailer is an illustrative 3D model you can turn by dragging: visual tilt is capped at ±15° per axis, while the numeric angles keep their full range. It does not represent your measured vehicle geometry.

Choose degrees or grade, millimetres or inches, and your preferred gauge smoothing in Settings. Display smoothing changes the motion of the instrument, not the sensor's calibration or level criterion. Dashes mean a reading is unavailable, not zero. Height guidance is unavailable in inverted poses.

Update firmware

1. The app checks for compatible firmware when it opens. Choose Update now or Later. You can return to Firmware update in Settings.
2. Keep your phone nearby, the sensor powered and the app open. Follow the transfer and restart progress. Firmware included with the app is available offline.
3. Wait for the sensor to reconnect and confirm the running version and saved setup. Transfer reaching 100% is not by itself confirmation that the new firmware is running.

If Bluetooth disconnects, the app closes or an update is interrupted, reopen Leveller and let it reconnect. It checks what is actually running before offering the next action. Retry only when offered. A rejected new image can fall back to the previous valid firmware.

Connection and setup help

Sensor not found: check its power, keep it nearby, allow Bluetooth permissions and keep the app open. The sensor's LED can turn off while it remains connected; check the connection status in the app.

Calibration or save failed: follow the displayed error. Keep the sensor stationary for calibration and repeat setup before relying on the guidance. Persistent sensor or storage errors need a power cycle or service advice.

Changing phones or removing local information: Forget sensor removes its saved selection in the app. Uninstalling or clearing app storage removes phone preferences, but does not erase calibration and measurements on the sensor.

Sensor cannot boot or connect: contact support. Ordinary app updates do not require opening the sensor or connecting a programming fixture.