- Remove the phone case for better accuracy.
- Touch the Compass icon.
- Tilt the phone at different angles to calibrate the level. When this is finished, a compass will appear.
- Slide your finger from right to left and magically the spirit level will appear.
- Place the phone on a kiln shelf, and adjust the shelf until the two circles overlap.
- A green screen will appear, indicating that the shelf is level.
Other brands of smartphones can also level a kiln and the directions would be similar. Before you trust the accuracy of any smartphone, please test it with a good spirit level.