Review on 🎯 Enhance Accuracy: Introducing Truweigh Calibration Weight Class Precision by Athenasby Whitney

The OIML M1 specification to which this weight conforms states that the actual weight is within 0.005% of the listed weight. For a weight of 200g that means +- 0.01g, so it should weigh between 199.99g and 200.01g. But the question is, of course, how do you know? To determine this, you need a calibrated, already calibrated scale. So you are relying on the manufacturer of these weights which appear to be made in the same factory. Given that calibration weights of this size cost about ten times as much as this one, I'm slightly suspicious that the M1 claim isn't guaranteed. If you have access to a calibrated, high-precision scientific balance somewhere, weigh yours to be sure. If it's light or heavy you can add/remove material in the hold below, although removing fractions of a gram is difficult.