That's actually not a fish scale, it at least it didn't start out as one. That is a scale that a surveyor uses when pulling steel tape to measure in the field. The steel tapes they use are calibrated to have a certain amount of tension on them, and you also record and compensate for the current temperature when doing your balance calculations. This was back in the days before EDM guns and now GPS.Found this old (Made in the USA) brass fish scale at the same estate sale as the band saw (fish scale was FREE).......I don't think you can get any made in the USA today. Hoping it will be good for checking that knuckle bearing preload. Works smooth and resets back to zero. I will be able to check it's accuracy with some calibrated weights I have at work.
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This is what they look like new, I have 2 of them. They are great for checking bearing preload when doing knuckle rebuilds.