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180 points Tomte | 1 comments | 20 Oct 24 10:18 UTC | HN request time: 0.204s | source

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rchowe ◴[20 Oct 24 12:11 UTC] No.41894824[source]▶

I built a computer vision device that used the top-down area of a penny as a calibration standard. Coins are useful, easy-to-get items that have relatively tight manufacturing tolerances.

replies(2): >>41894944 #>>41895122 #

qup ◴[20 Oct 24 13:05 UTC] No.41895122[source]▶

>>41894824 #

Also a penny is .750 exactly. None of the other US coins have a "useful" diameter.

replies(1): >>41895350 #

1. dotancohen ◴[20 Oct 24 13:49 UTC] No.41895350[source]▶

>>41895122 #

The US nickel is so close to 5 grams that I've seen them used as weights in a laboratory.

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Using Euro coins as weights (2004)