As a drives, conveyance and software engineer (and hence very familiar with load cells), I’m aware of ways around these things, but it’s the refusal of the manufacturer to provide this data that I find unacceptable. Just about every other bit of technical kit that I buy I can get a technical service manual for, even if the kit needs specialist kit to maintain it, so why can’t they? Where I failed was not checking the availability of a technical service manual before I bought it, but it won’t happen again.