Calibration Weights - SODIAL(R) 6pcs 100g 50g 20g 10g 5g Portable High Accuracy Mini Digital Jewelry Diamond Weight Weighing Scale Farmar+Tweezer 100% Brand New and High Quality. This is a must have for anyone with a pocket scale. This precession calibration set has all of the weights you will need and more! Smooth surface.The tweezers is Convenient to hold all of the weights for quick easy access. Permissible Error: +/- 0.003g; Material: Iron + plating