Review on Digital Magnetic Level Protractor Inclinometer by Virgilio Patton

After calibrating this instrument four times, it still gives inconsistent readings. Placing the tool on an incline will give you a reading in degrees, but rotating the tool 180 degrees in the same spot will give you a different reading in degrees. These readings should be the same. No matter which scale you use, the readings will never be the same. Completely useless for my purposes.