When measuring the angle, you will have a voice prompt for three ranges: close, very close, or perfect. The voice prompt allows you to keep your eyes away from the screen. • Displays the angle of tilted surfaces in numbers, showing the difference from the desired angle. • If the back of your device is not flat (such as a protruding lens or other accessories), you can put the screen face down to measure the angle. It is mobile spirit level with high accuracy. • Can lock the current measurement as the target angle (can use the VOLUME UP button on the device or button on screen to lock the angle). • Can save the current measurement as the history record (can use the VOLUME DOWN button on the device or button on screen to save the record). • Can save up to 20 history records for your review • Laser Leveling function. Please note that you must grant permission of Camera and Storage for this feature). You can preview and take photos for checking horizontal or vertical via camera, just like laser alignment tool. • Can set the degree of error for each applicable angle range • Can set the measurement frequency (1 second to 3 seconds) • Optional mute or audible mode • Calibration function • Can adjust beep volume • Easy to use, professional • As a substitute for spirit level, angle finder, clinometer • Clinometer for carpenter • Support languages: English, French, German, Portuguese, Russian, Spanish, Japanese, Korean, Traditional Chinese, Simplified Chinese