Metrical Calibration

Weight Handling Standard Operating Procedure

Best practices for precision calibration weights

Handling

• Always use tweezers or gloves for mg and g class weights
• Never touch weighing surfaces with bare hands
• Place weights gently on balance pans
• Store in original cases in controlled environment (20°C ± 2°C)

Cleaning

• Brush lightly with soft bristle brush
• Use approved cleaning solvents only when necessary
• Re-calibrate after any cleaning procedure

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