M1, M2 and M3 Test Weights - Shield Stamped

  • 'Test' Weights - Used for calibrating scales, load testing lifts, cranes, lifting platforms, etc. M1 is the most accurate, then M2 and M3.

  • M1 Test Weights - Used to calibrate precision scales. If you are in any doubt as to the resolution of your scale (how accurate it is) select an M1 Test Weight.  

  • M3 Test Weights - Typically used for Load Testing cranes, hydraulic lifting platforms, lifts, etc. 

  • Shield Stamping Test Weights - If your business operates with ISO9001, 'Test' Weights for scale calibration must be independently verified by Trading Standards. The lead in the adjustment pocket is stamped with their official 'Shield Stamp'. A Trading Standards Certificate is always issued with a Test Weight that has been Shield Stamped. One certificate will cover a batch of weights, of different denominations but must be on the same order and for the same customer. 

  • For load testing purposes an M3 Test Weight is adequate and is unlikely to require Shield Stamping unless the weight will be audited under an ISO9001 QS, or similar. 

  • Serial numbers can be stencilled or stamped onto these weights using metal stamps so the weight is then fully traceable and linked to a certificate.


UKAS Test Weights 

  • UKAS Test Weights are calibrated to M1. They are then submitted to a UKAS approved laboratory and tested under the requirements of UKAS. 

  • Each weight must be given a serial number so that each weight is identifiable on the UKAS Certificate. The serial number can either be stencilled on or stamped onto the weight using metal stamps.



Quick Guide to Buying a Calibration Test Weight

James W Shenton Ltd

Tinsley Street 

Great Bridge 



Tel:  0121 557 5124



For further services and information go to:



Trading Terms & Conditions with James W Shenton Ltd 


Test Weights

Traceable to National Standards. 


Made in the

West Midlands, UK.

Certificated by Trading Standards




Copyright James W Shenton Ltd