Cannot Calibrate – RIDGID Level Review

The way this app is designed requires a completely flat surface to “calibrate” the app. However, all this truly does is zero the level. To calibrate is a multi-step procedure which involves taking a reading, then rotating the device 180 degrees and taking another reading, the device should then be able to calculate a true zero. However, the procedure used by this app will only read as level as the surface one zeros the app on. Yet there is no way to know if that surface truly is level.
Review by Trogenator on RIDGID Level.