... that buyers also need to order, or have on hand, a 100-gram (gram, not grain) or a 50-gram check weight to calibrate the scale.
I received my scale promptly (4 days to central NC) from Cambridge Environmental Products in Canada, for $485 shipped (using discount code "CAMBRIDGE" as shown on this page from their web site). I knew I needed a check weight, but I did not read the documentation carefully enough before ordering. I thought I could use a 50-grain weight. NO. For this model, a 50- or 100-gram weight is required.
CE Products offers a 100gram weight for $15... probably makes most sense to order one with the scale. Cheaper ones are available - but my question is how close to 100 grams those weights actually are. Yes, device consistency trumps check weight super-precision, but if we're going to order a super scale, does it make sense to skimp on calibration weight?
Observations on my uncalibrated scale: With check weights, I observed a consistent, repeatable 0.04-grain overage per 10 grains. In other words, whatever combination of weights I used to total 10 grains or multiples of 10 grains consistently, repeatably produced 10.04 / 20.08 / 40.16 grain readings.
So now I'm off to order a check/calibration weight.
I received my scale promptly (4 days to central NC) from Cambridge Environmental Products in Canada, for $485 shipped (using discount code "CAMBRIDGE" as shown on this page from their web site). I knew I needed a check weight, but I did not read the documentation carefully enough before ordering. I thought I could use a 50-grain weight. NO. For this model, a 50- or 100-gram weight is required.
CE Products offers a 100gram weight for $15... probably makes most sense to order one with the scale. Cheaper ones are available - but my question is how close to 100 grams those weights actually are. Yes, device consistency trumps check weight super-precision, but if we're going to order a super scale, does it make sense to skimp on calibration weight?
Observations on my uncalibrated scale: With check weights, I observed a consistent, repeatable 0.04-grain overage per 10 grains. In other words, whatever combination of weights I used to total 10 grains or multiples of 10 grains consistently, repeatably produced 10.04 / 20.08 / 40.16 grain readings.
So now I'm off to order a check/calibration weight.