For sale different used calibration weights by among others Mettler Toledo, Zwiebel/VWR International and Sartorius. They are made of stainless steel with tolerance classes F1 and E2. These tolerance classes are suitable for laboratory applications.
The weight of the used calibration weights was checked on a calibrated analytical balance as shown on the pictures. Some calibration weights have an expired certificate, but they are not calibrated in accordance with NEN ISO 17025 at this moment.