This is a level gauge to measure the horizontal state based on the beepWhen adjusting the table adjuster in order to make a horizontal balance, you will not notice its unbalance till you check if it is really horizontal or notHowever, "LevelBeep" tells you its horizontal status even when you are under the table by its various kinds of beeps.

Main function
1.Notice the horizontal status by the beep
2.Display the angle of Z axis
3.Adjust the horizontal instability caused by iPhone's individual variability by using the calibration
4.Make a target on the arbitrary point expect for the horizon