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It not the tolerance that get me, it is that it the reading varies because the temperature. One corner changes 3/4" just because of the temp.I don't know what the tolerance is for the unit but I'm looking at 1/4 inch discrepancies? This could be wind, it could be a leveler shifting, it could be where someone is standing in the coach. It is a very sensitive unit which is what I like about it. I use it to level and then turn it off to save battery. I don't go back to it any time after that to see what it shows. I'm sure it could show deviations from when I leveled. The best leveling sensor is my head. I know when it's not right, if I feel that I'd check it.
I have this app too. I lay my phone on the kitchen counter and check it after the auto-level system on the RV does it's thing. It's almost perfect every time.This is the "Bubble App" which I use on my Galaxy S-20.
Open the app, lay it on the floor, hit automatic level, & if needed use manual override.
It measures in degrees, the "yaw", right to left or front to rear. Very accurate!
I'm pretty "OCD" about leveling, but this little beauty is FREE!