OrangeA Calibration Weight Set F1 Grade Calibration Weight Kit 1 mg to 1000g Stainless Steel Digital Scale Calibration Weights for Accurate Balance Weights

It is great

Two stars for a nonsense Description. A weight that meets Nist Class F specifications is not very precise, its used for cast iron test weights for elevators, or industrial weighing. There is no such thing as Nist Class F1, F2, or M1. NIST-F1 is a cesium fountain clock, a type of atomic clock, in the National Institute of Standards and Technology (NIST) in Boulder, ColoradoI expect that the proper specification is OIML, not Nist.

The calibration weights are in good order; however, the container for the set in not very sturdy and the latch is misaligned. What is think is the calibration certification does not have details, it is not in English and no apparent tractability between the certificate and the test weights.