MAGIKON Precision Steel Scale Calibration Weight Kit , M2 Class , 105 Gram Calibration CLASS:M2 WIDE USE:for Digital Jewellery Scale, General Laboratory, Commercial, and Educational use WEIGHTS:1 by 50g,2 by 20g, 1 by 10g, 1 by 5g SHAPE:The shape it designed uniquely for using Calibration Permissible Error: +/- 0.003g