Turn your device into a Spirit Level (also called a bubble level). • Bulls eye level with roll & pitch gauges screen • Horizontal and vertical bubble level and angle gauge screen. • Calibration feature to correct for accelerometer misalignment & different axis sensitivities. For best results touch CAL and calibrate first. The Spirit Level is only as good as your accelerometer. For indication only. Don't damage your tablet or phone, use a real spirit level when appropriate. • Pause button