For help with Plumb, email support@nationaltoolworks.com.
Please include your iPhone model and iOS version when writing in.
The bubble appears to drift — is something wrong?
Drift can occur if the device is in motion or if the gyroscope needs calibration.
Try placing the device on a flat surface for a moment and allow it to settle.
You can also use the calibration reset in Settings if drift persists.
How do I switch between bubble, angle, and bullseye modes?
Swipe left or right on the main screen to cycle through the three measurement modes.
Can I use Plumb on iPad?
Yes. Plumb runs on iPad as well as iPhone. All measurement modes are available on both devices.
What does the AR mode do?
AR mode uses the camera to overlay a live level indicator on whatever you're pointing the
device at, making it easier to see true level on walls, shelves, or surfaces.