This topic has had discussion in the past but:
Collecting vibration data - system integrity check to ensure valid data (transducers, cables, instrument) - goes without saying. But placing the transducer solidly and time delay plus no cable strain against the transducer; how careful are we?
Spirit vial level: calibrate before each use? Calibrate as necessary. Allow thermal stability? Are all taking the time to ensure valid data?
Optical alignment: calibrate before each reading or each new transit mount - if you move it any, recalibrate!
Dial indicators: calibrate each time or have established stamped known repetive values in dedicated brackets.
Laser alignment: check calibration each use at every alignment job? Or assume it's OK.
Do you think data integrity is addressed adequately in the work place? Interested and curious.