How many of you still use these?

ChazzC said:
Reminds me of a ChemE PhD candidate in the early 70's who used a magnifying glass to read his slide rule from two vantage points, then averaged the readings to resolve parallax. But then he always aligned the slot-head screws on his experimental setups so they were vertical to avoid dust collecting in the slots and introducing error.

I, too, have several old school vernier calipers; this 24" one states that it can resolve 0.05mm/0.002":

View attachment 433510
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Wow, That's some fine resolution for these!
 
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