American Weigh Scales 500 Gram Calibration Weight + 200 Gram Calibration Weight + 100 Gram Calibration Weight + 50 Gram Calibration Weight Suitable for general laboratory, commercial, and educational use. OIML Class: M2 500g Calibration weight + 200g Calibration weight + 100g Calibration weight + 50g Calibration weight Calibrates Digital scales that require 500g / 200 / 100g / 50g Great Value