Our $40
scale is much better than the $15
scale, but much less portable. Unfortunately, I think we only have one $40
scale left and perhaps zero when you read this, and production has been discontinued. The $15
scale is typical made in
China - seems amazing for the
price, but don't expect it to last a lifetime.
Our coin descriptions include the
weight to 3 decimals (1/1000s). Including three digits is intended to make it clear that the first two digits are accurate (anyone who actually cares probably understands that). We actually use
scales that indicate 4 decimals. One of them has a
glass box over the
pan to prevent air movement. The other one does not but it is a more expensive
scale and seems to be just as accurate without the
glass. We calibrate them now and then. When weighing a coin, the 4th decimal rarely locks on a single numeral, but usually the 3rd steadies on one or two numerals. When we re-weigh coins they are often the same to the third digit, but definitely not always, especially if weighed on a different day. When we weigh a coin that has a previous
weight recorded by someone else, the third decimal rarely matches. Perhaps that is because they were at a different elevation.
