Электронный отвес is a free Android utility that allows for remote vertical control. This app requires a minimum of two devices - one acting as the sensor and the other as the receiver. Both devices must have a functioning WiFi connection and a common WiFi router.

To set up the app, select a common port for data exchange on all devices. On the receiving device, choose the sensor address from which to display data. This address can be found in the sensor settings dialog.

Prepare the sensor attachment on the object to be monitored, such as a wall or pole. Press the "Remember Initial Position" button and secure the sensor to the object within 10 seconds.

Once the setup is complete, the monitoring process can be initiated on both devices. The sensor screen can be turned off, but if the Android version is above 2.3, the accelerometer should continue to function even with the screen off.

The indicator ball is located at the center of the "target" and will tilt within a range of +/- 3 degrees. The second circle represents a range of 25 degrees.

Permission is required to obtain a unique Android identifier for smartphone communication, which is entered in the settings.