My eyes are not so sharp anymore, and I can't read the vernier too well on my calipers without a big magnifying glass and a bright light, so I bought myself a cheap Chinese made digital caliper from Harbor Freight today.
I immediately zeroed the and checked two alloy seat posts, which were unused and clearly stamped with their respective diameters. The smaller of the two measures 0.2mm too small, and the larger of the two, 0.2mm too large.
I checked with my old verniers and got very nearly the same results. (Any differences were minuscule).
This leads me to believe that my new digital calipers are reasonably accurate (or at least no less accurate that the results I get with my thick glasses and ancient vernier.)
- So What do you think?
- Are seat posts generally subject to such wide manufacturing variance?
- Could BOTH measuring tools so innacurate?