Bubble Level is very easy and simple and accurate easy-to-use in daily life. - Can be used to adjust the horizontal angle to the Calibrate button. - Allows you to reset button to return the value of the device-specific horizontal origin. - Correction setting is retained even when the origin of each application run again. Note) Due to the sensor or the surrounding environment of the device manufacturer, the accuracy may be reduced. The device can not access the sensor may not operate properl