I use the 24" Stabila (Smart Tool) for my work when I verify slope of clean steam and deionized water piping during pharmaceutical facility validations. The stabila does all the same things except temperature (which I have other much better calibrated instruments for) If I had it to do all over again, I would get as short a level as possible, as it is more versatile. Like the A&P's I have to calibrate every year to NIST standards for traceability, which is probably why the A&P's calibrate also. Calibration of the level costs about $90 (I spend probably $800 a year in various equipment calibrations). Most big cities have companies that perform calibration, otherwise the instrument can be sent out (like I have to do for my laser range finder - accurate to 3mm at 600ft!).
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Kai Schumann
RV-8 Dreamer
Daily Lurker
VAF # 676
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