Very nice, I’m assuming a high level of repeatability as well.Ahh Jim, the old scale in the picture would more properly be called a balance, it doesn't weigh anything. You need to zero it using a known mass. This particular one was made by Pacific, and at a total guess, probably dates from the 1950's. It's not damped in any way and just so simple there's very little to go wrong.
The balance was supplied with a set of grain checkweights, including some little 10th gn weights.
I also have another of this type, also Pacific, oil damped, I would guess of a slightly later date.
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Towards the the op topic… I’ve settled on a pair of 20 grain checks that actually come in at 20.02 on my E scale and confirmed on my beam scales.
Added: when I’m done with a session and my scale pointer isn’t quite at zero I’ll place my 40.04 weights in the pan to verify it’s still perfectly calibrated.
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