17Pcs Precision Calibration Weight Set，Precision Weight- 1 x 100g,1 x 50g,2 x 20g,1 x 10g, 1 x 5g, 2x2g, 1x 1g, 1x500mg, 2x200mg, 1 x 100mg, 1 x 50mg, 2 x 20mg, 1 x 10mg

Great product

Best product with accuracy

Test certificate not provided /calibration certificate required

I purchased these calibration weights to ensure the accuracy of my scales. These weights arrived well-calibrated themselves, and when I used them to check the accuracy of my scales, they consistently registered the correct weight. This leads me to conclude that they have been accurately calibrated. Overall, I'm very satisfied with this product as it serves its purpose perfectly. I highly recommend it for anyone who needs to calibrate their scales.

Weights were accurate for all but the most exacting work, most to the second decimal. Smallest weights had most variance.

These were not as accurate as I was hoping, but a decent value. So I will keep them. The smaller weights are small rectangles of sheet metal with a bent corner. It comes with a very cheap pair of tweezers that works OK but not great. The small rectangular weights are not well labeled, perhaps not at all. My eyes aren’t what they used to be, but I am wearing reading glasses.

Definitely not laboratory grade, but the weights were surprisingly accurate for the cost. Most of the larger weights were accurate to 0.1% (eg: 100g +/-0.1%) the lighter ones varied a bit more, with the most inaccurate being the little 'wafers' at +/-1 percent : eg: 100mg = 98mg, 20mg = 22. The really small ones: 10 and 5 mg were 11 and 4-6. But that's at the edge of my resolution. Bottom line: I would NOT use these to calibrate for gold or medical work, but may be fine for casual or culinary applications. I'd have given this an overall 4 stars except for the quality issues below. The case is awful : very cheaply made, not obvious in the photos. Doesn't really hold the components in place very well at all. My set arrived with all the 1,2,5 and 10g weights outside their sockets and rolling around inside the box. The foam insert in the cover needs to be much thicker so that the weights are kept in place. The 'wafer weights' come in a little zip-lock that is tricky to empty, and the wafers themselves fit very oddly in the holes provided. The plastic strip that covers them is el-cheapo and doesn't lock into place. One end protrudes from the slot (look closely in the product shots, on the right side.) You definitly don't want to let this box tip over or go on it's side, or you'll be fishing components out the rug for hours. The little plastic tweazers they provide are next to useless and are too clunky for everything below 20g. Forget using it with the wafers. That said, with a bit of curtailed expectations, it's a decent little kit.

It’s nice to have a set of these for my own personal use. This was great for the money. The set is good to use at home and not have to go back into the store I purchased from.