At times I wasn't certain if outgoing mail needed more than a 1 oz. first class stamp, so I'd have to drive to a post office. I decided to build my own scale and it works. A simple balance-beam scale is easy to build. Comparative mass for a one ounce weight (28.3 grams) is almost exactly the same as five modern US quarters (28.35 grams).
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In my picture I included five quarters in the packages at each end of the scale. It seems the loaded envelope plus stamp is a tiny bit heavier, so I need to add postage.
All I needed was an inexpensive laundry hanger section, a few paper clips, and a tool or two, and I was set.
