On another thread, the subject of triple beam scales came up, so rather than hijack that thread, I'm starting a new one.
My scale's beam mounted counterweights only went up to 610 grams, even though the max capacity was labeled 2610. Optional counterweights were required to measure the max, and came in a set of one 500 gram and 2 1000 gram. The extra weights hang from grooved posts in the right end of the beam. By trial and error, I found that the 500 gram counterweight was 147.5 grams, and the 1000 gram was 295 grams.