I recently upgraded from a cheap 4 year old carat scale to a more costly Ohaus TAJ carat scale.
Ive never really owned a large "proper" carat scale before and this one has some drift at zero, usually flickering between -0.005ct/0.005ct & 0.010ct & -0.010ct.
Is this normal on larger carat scales (or any scales?) Previous one didn't have this but it was extremely basic.
On my travels and when I buy from brokers their commercial scales all seem to have some flickering drift.
The problem with scales with three digits of precision is that air movement in the environment will show up. That is why most high end scales have a glass enclosure.
Thankyou This does have a draft shield. I left the scale on for 20 mins today and the drift went slowly up to -0.120cts. It would not stopincreasing.
Am i right in thinking this is faulty? I paid alot for the scale and did not think id have this much drift
I had a look at my scale yesterday and today. It is always on, and only drifts +/-0.001 g. No way a scale should drift that much. You made the right move.
Thank you 1bwana1 It was proving a headache, so returned this morning. Will look for legal tender scales next
Last time I bought a quality desktop "Legal Tender" scale I also had to send the first one back because the calibration was inconsistent. The second one has been rock solid so far. If you have ever learned the GIA requirement for weighing stones, and rounding to two digits, you know how important that third digit is. Also, very important in calculating SG in the lab. You did the right thing.
Joined: Fri Jun 25, 2010 12:04 am Posts: 257 Location: Idaho
We have a nice set of precision scales, +/- 0.001 ct. VERY sensitive to light air flow, temperature changes, and vibration from the nearby 5 lane highway - we are next to the busiest intersection in the state. I know - that doesn't mean a whole lot, since it is only Idaho...
It was OK until we moved it from a heavy desk to a lighter counter in our vault, probably twice the swing now. I thought the concrete walls of the vault would dampen things. Maybe there is a jack hammer banging through the wall from next door?
0.0002 grams (.001 ct) is a very very small amount of change.
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