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[Apoorva Yogi]

Our sweet kitchen uses maximum weight for weighing raw material is 12 kgs. How many calibration reference weight we need and of what should be weight for reference weights. 

[beautiophile]

5 weights.

3 of them can guarantee the linearity of calibration graph. The extra two are spares for disregarding an outlier (if it appears) and determining the usage range.

The lightest calibration weight has to be equal or lighter than the smallest quantity you would measure.

For example, the product mass varies between 2kg to 10kg, 5 calibration points should be 1kg, 2kg, 5kg, 10kg and 12kg.