GRAM F1 INOX precision weights are machined in stainless steel to deliver OIML F1 class accuracy, with a maximum permissible error of just ±5 mg at a nominal value of 1 kg. This class makes them the right choice for traceability of F2 and lower-class weights, and for verifying weighing instruments of OIML accuracy class I — including the calibration of high-accuracy class 2 balances. Built to withstand daily handling in laboratory, industrial and calibration environments, each weight holds its certified mass over time — the stable reference point that keeps every high-precision result trustworthy. Optional F Class traceability certificates (up to 2 kg, and for 5, 10, 20 and 50 kg) add documented proof of accuracy, while the dedicated 5 kg and 10 kg weight handlers make safe, ergonomic handling part of the standard routine.