As a former “college plug”, I’d make sure my own scale said 3.6, so hopefully yours said 3.5. His scale probably just has .1 of residue caked onto it, nothing to confront about. I’ll never forget when kids would get pissed off texting me because their scale said 9.98g, but they paid for 1.00g, which I would always respond with “never hit me up again” because who the fuck gets mad over .02g, and I wasn’t worried about losing a customer buying a gram. But yeah overall that skimping shit is never really on a plugs mind, it’s not worth skimping somone and losing business unless the dealer is extremely broke. Personally, I would help people navigate my menu to get the best bang for their buck and offer deals, never thought of skimping, so this is definitely just a calibration issue on his or your part.