Originally posted by goph3r
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All inclinometers, including precision bubble levels and the digital inclinometers and accelerometers found in modern smartphones (and the SkyTrak unit), drift, and need regular calibration.
The quick way to check calibration is to set the SkyTrak on a known-level surface, such as a pool table or granite countertop, check what the level or app says, then turn the unit 180 degrees and confirm that the level or app still says the same thing. If the level magically changed 180 degrees along with the turn, then the instrument is out of calibration.
If the SkyTrak level doesn't have a calibration or zeroing feature, it's fairly worthless to depend on. But in absence of a calibration feature, just turn it 180 deg and check for an exact opposite shift of tilt/rotation, in which case the unit is actually level.
(As one data point, I just checked the level of my unit while sitting on my known-level pool table, and it was at perfect 0 deg on both axes.)
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