Review on 💎 Advanced Precision Calibration Lab for Jewelry Education by Dustin Keller

I bought 10 engineering and physics kits for experiments and projects. I checked the accuracy of all of them and they were all within a tenth of a gram of the printed weight (this is my scale's tolerance, they can be more accurate). Of the 80 weights, only one had a slight dent and three noticeable scratches, but they were still accurate. 8 out of 10 hulls were cracked or damaged. One had a half-cent sized hole and the other had the bottom completely under a 200 gram weight. They are so poorly made they won't last long anyway so I make a wooden holder for them. In summary, the cases suck, but the weights are inexpensive, accurate, and great for my purposes.