I love my postage scale too - but it doesn't help you with the thickness rule! I found that out the hard way and decided to do something about it for my quilting friends.
I recently made some quilted postcards for a swap and didn't have this and I literally crossed my fingers as I tossed them into the mail bin. After that, I created this tool for myself.
Originally Posted by Iamquilter
When I retired from my job my boss gave me the little postage scale so I can test my envelopes at home and know how much postage to put.