Calibration Weights

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The use of weighing scales in harsh working environments is happening more and more. Scales should be used in non-abrasive conditions, but this is not always practical. Water and dust ingress can cause serious damage to the sensitive electronic components in your device. Over time, their accuracy may become compromised without your knowledge. You can combat this by checking your scale’s accuracy with a calibration weight. This will help you to understand the inaccuracy of your weighing scale at specific points of measurement. Improving the integrity of your measurements is critical in a professional environment. Maintaining traceable accuracy on your weighing measurements is paramount.

Calibration Weight Classification

Each classification specifies maximum error discrepancies from a nominal value. The classification given to a calibration weight also depends upon its material, density, corrosion resistance, hardness, wear resistance, brittleness, magnetic properties, construction, and surface finish.

OIML Calibration Weight Classification Notation Error Discrepancy Material
E1 Weight standards of the highest accuracy class, mostly only used as reference standards for metrological services. The maximum error discrepancy from nominal value at 1Kg is 0.5mg. Stainless Steel.
E2 The most accurate test or adjusting weights for high resolution, high precision weighing scales. The maximum error discrepancy from nominal value at 1 kg is 1.6 mg. 1mg to 5mg Aluminium, 10mg to 500mg Nickel Silver, 1g to 20kg Stainless Steel.
F1 High precision weights suitable for testing, calibrating and adjusting most high precision weighing scales. The maximum error discrepancy from nominal value at 1 kg is 5 mg. 1mg to 5mg Aluminium, 10mg to 500mg Nickel Silver, 1g to 20kg Nickel Plated Brass.
F2 High precision weights suitable for very accurate precision balances. Ideal weight classification for weighing applications involving high value commercial transactions, e.g. precious stones. The maximum error discrepancy from nominal value at 1 kg is 16mg. 1mg to 5mg Aluminium, 10mg to 500mg Nickel Silver, 1g to 20kg Stainless Steel.
M1 Precision weights for trade weighing scales. The maximum error discrepancy from nominal value at 1 kg is 50mg. 1mg to 5mg Aluminium, 10mg to 500mg Nickel Silver, 1g to 20kg Brass.
M2 Precision weights for testing, calibrating and adjusting trade balances. The maximum error discrepancy from nominal value at 1 kg is 160mg. 1g to 2kg Brass, 5kg to 20kg Cast Iron.
M3 Trade weights for everyday use with weighing scales. The maximum error discrepancy from nominal value at 1 kg is 500mg. 1g to 2kg Brass, 5kg to 20kg Cast Iron.

When a company is certified for quality assurance to ISO 9001-9003, it accepts the obligation, in respect of control of its measuring equipment, to periodically test, or have all of its measuring instruments tested on a regular basis. The testing must be documented and made available to an auditor or customer upon request.

The below table is a UKAS (United Kingdom Accreditation Service) guideline for selecting the most appropriate calibration weight for your weighing scale.

 

Weighing Scale Resolution

Weighing Scale Capacity

100g 10g 1g 100mg 10mg 1mg
Up To 500g  M3  M3  M3  M2  F2  E2
 Up To 1Kg  M3  M3  M3  M1  F1  E1
 Up To 5Kg  M3  M3  M2  F2  E2  
 Up To 10Kg  M3 M3  M1  F1  E1  
 Up To 50Kg  M3  M2  F2  E2    
 Up To 100Kg  M3  M1  F1      
 Up To 500Kg  M2  F2  E2      
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