About the calibration weights. I've owned more than 4 of the digital scales which I got from Ebay ranging in price from $6 to $10, and none came with calibration weights. I did buy a cal weight for one just for grins.
In all the time I've been weighing detecting finds, and testing the integrity between each scale per the item of the day, I see an uncanny agreement on each w/o anything more required than hitting the Tare buttton first. My cal weight has collected dust for years.
Unless y'all are trying measuring flakes of gold, I feel you are over stressing on digital pocket scales. Ebay has always done me well on a $5-$10 set of scales, each measures "right in" in comparison, so unless every one of them is skewed/uncalibrated exactly the same...they are perfect for most of out needs in this hobby.
It might be an issue if you are lookeing to read 0.001g resolution which really requires a hood to stop any slight wind movements if you want it perfect. I can't personally imagine needing 0.001g accuracy myself.
If you are just wanting to weight your silver rings and basic detecting finds, you really can't beat Ebay. No driving, no tax, 2-3 days the Brown Santa comes to your door. All brick and mortar stores and those sellers buying and re-selling these things, have their markups. What do you get by electing to buy through those for ore cost? martin
