Discussion in 'Coin Chat' started by JeffC, Jun 2, 2020.
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@Paddy54, @Danomite, thank you both. Standards!
Thanks for the link. Because I noticed that these are sold everywhere and some quite cheaply, I wondered how good some of these are. I don't want to buy standards that are cheaply made (not accurate) and then end up calibrating my scale incorrectly. Thus I was wondering if some of these standards or calibration weights come with certifications.
They may have individual weights , didn't check. Usually any small % variation of a calibration weight will not make any difference with coinage. What I do is to take my calibration weight to my college lab and have them weighed on a 00.001 gram balance every couple of years after I change the battery in the scale. If you don't have a college near by, a pharmacy or a jeweler ( as their products have to have a precise number) may be able to tell you the actual weight.
Yeah, my cheapo scale requires a 200.00 g calibration weight. I just took a clean widemouth bottle and put it and the lid on a balance that weighed to 0.0000 g. I then added table salt very carefully until I had it fluctuation on the last digit, volia my calibration weight.
Edit: added info.
Make sure the lid seals very tightly. Over time salt will absorb moisture out of the air and become heavier.
Calabrating with a weight that can vary +/- .19 grams isn't a very precise calabration.
Too dependent on humidity?
Accepted. Should have used sand.
Correct...but in the food business they are called standards,as most states have a tech come in and make sure the scale is correct.
These of course were larger weight's to see if the scale is true.
It's a state run agency called( weight's and measures. )
They also measure the gas stations to make sure that what is in the jug is the same measure on the pump.
Out of curiousity, how often to they send inspectors down to your store?
I was going to buy a set of weights but one of the reloading forums mentioned using a copper jacketed bullet (Bullet only and not the cartridge case) as they are very uniform in weight. Fortunately I knew someone that reloaded and they hooked me up with some match grade jacketed bullets very uniform and I was able to calibrate.
Hth. Good luck!
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