Adam Equipment ASTM 1 - 50g Weight
Digital scales come factory calibrated, but there's a chance they can fall out of calibration during shipping or after use. Use this ASTM Class 1 50g calibration weight to test and calibrate your digital scale, so ya know it's nice and accurate.
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Free US FedEx Ground shipping is for online orders greater than or equal to $500 if the item weighs less than 100lbs (actual and dimensional weight) and is inside of the contiguous United States (excluding Hawaii and Alaska).