Your scale is not accurate forever - if you don't calibrate it regularly. Recommended calibration is every 6 months, depending on how precise your scale is and how often do you use it. So a calibration weight or weight set is a must-have tool to calibrate your scale and to test your scale within tolerance. This 250 gram weight is ideal for scales and balances with 0.01 gram or higher increments. They are inexpensive but very accurate.
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