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 Post subject: Which digital scale balance to weight stones
PostPosted: Mon Jul 06, 2020 8:36 pm 
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Joined: Mon Sep 03, 2012 11:32 am
Posts: 73
Please recommend a scale/balance that accurately weights gems and lasts long.

I got a couple but they show inaccurate weights


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 Post subject: Re: Which digital scale balance to weight stones
PostPosted: Mon Jul 06, 2020 10:36 pm 
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Joined: Tue Apr 05, 2016 7:58 pm
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Location: San Marcos, CA
Mettler, OHaus, Sartorius are top scales in the commercial trade. They are pricy but accurate. Many scales on the low end will vary in the accuracy in a small amount. Most come with a weight for checking it's accuracy. And most have the ability to reset to zero on a common calibration weight. So say you have a scale you believe is the most accurate with given calibration weight, you then use the weight on other scales to calibrate them to each other. But generally speaking a $40 scale is as good as another. Typically accuracy is not what drives the price, it is the specific specs one scale offers over another, like min-max weights, UOM, overall size and more important is accuracy point ie: .0001 or .0005.

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 Post subject: Re: Which digital scale balance to weight stones
PostPosted: Mon Jul 06, 2020 10:41 pm 
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Tanitas are doing the job reasonnably well without breaking the bank: https://www.tanita.com/en/carat-gem-scales/

For professional use, I'd recommend a Mettler Toledo.
https://www.mt.com/de/en/home/products/ ... -and-specs


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 Post subject: Re: Which digital scale balance to weight stones
PostPosted: Tue Jul 07, 2020 9:43 am 
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I have never had very good luck with the cheap scales.

But, at a minimum the scale you pick should have an accuracy to 0.005 carat.

It should also have a wind shield as even the smallest amount of moving air will affect readings.

With these two attributes working correctly you should never be more that 0.01 off.

Look for a scale that is certified as "Legal for Trade".


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 Post subject: Re: Which digital scale balance to weight stones
PostPosted: Tue Jul 07, 2020 10:24 pm 
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Joined: Tue Apr 05, 2016 7:58 pm
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Location: San Marcos, CA
Let me clarify my earlier comment to:
But generally speaking a $40 scale is as good as any other $40 scale.
Just in case anyone misinterpreted that as a $40 scale is as good as any other scale.

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