Review on 📏 Smart Weigh 50g x 0.001g Digital Milligram Scale Set - High Precision, Includes Tweezers, Calibration Weights, Three Weighing Pans, and Case by Faith Miller

A few weeks after purchasing the scale, I bought a calibration kit (Weighing Calibration Kit for American WGHTKIT Scales, Class M2) sold at Revain for $11.69. It comes with 50g, 2 x 20g, 10g, 5g, 2 x 2g, 1g, 500mg, 200mg, 100mg, 50mg, 2 x 20mg and 10mg calibration weights. I weighed them 3 times on my scale using two rules: the scale must read zero both before and after the measurement, and the weights were placed in the center of the weighing platform. I have received the following results: 50g: 49.995, 50.003, 49.998 20g: 20.002, 20.001 20g: 20,000, 20,000 10g: 10,000, 9.999, 10,000 5G: 4.999, 4.999 2G: 1.99, 2000, 2,000 : 2,000, 2,000 2G: 2,000, 2,000 2g: 4.999, 4.999 2G: 1.999, 2000, 2,000 2G: 2000 2G: 2,000 2G: 2, 1.999, 1.999 1 g: 0.999, 1,000, 1,000 mg, 0 .00 mg, 0.09 mg: 0.209 0.099, 0.099, 0.099 50 mg: 0.051, 0.051, 0.051, 0.051, 0.050 20 mg: 0.021, 0.020, 0.019 20 mg: 0.020, 0.020, 0.019 20 mg: 0.020, 0.020, 0.09 mg: 0.019.09.019. 008, .009 calibration kit is "Class M2”. Not sure what that means, but I found a 1 gram M2 weight with an "OIML Tolerance" of ±3mg. The above agreement makes an excellent statement about both the "smart scale” and the calibration kit. It definitely deserves 5 stars. Today is May 13, 2019; almost a year since purchase. Since then, I've been using the scale every day to reduce my smokeless tobacco use. I'm now down to 0.205g a day, starting at over 10g a day, almost no dependency. In the last few months I've noticed a drift. My empty bottom of a can of smokeless tobacco with the weights just included weighed 9.254g followed by 9.240, 9.238, 9.237, 9.236, 9.237, 9.236, 9.237, 9.236, 9.235, 9.236, 9.235 which is about the right weight. The scale read zero both before and after each measurement. So I had a drift of 19mg. Alternatively, I can turn it on and after about a minute it changes to 0.008g. I will reset it to zero and it will move again. This drift didn't exist when I first got the scale.