Your internal quality requirements and relevant industry regulations also determine your process accuracy needs and tolerances. To determine the level of accuracy required, you must know the legal tolerances and your own process tolerances, which are defined in the table below. Then, you compare those requirements to the manufacturer tolerances that are specific to the equipment you are considering. Legal tolerances Legal tolerances stipulated by OIML R76 or NIST Handbook 44 (US only) assess legal for trade requirements. Manufacturer tolerances Manufacturer tolerances ensure that equipment meets manufacturer specifications. Manufacturer tolerances do not consider user specific process requirements, and are therefore unsuitable for improving the weighing process. Process tolerances Specific process tolerances defined by the user that support process improvements and savings on material, waste and rework. For scales in a legal-for-trade application, process tolerances should be applied in addition to legal tolerances.   METTLER TOLEDO's
Good Weighing Practice (GWP) Verification ensures that all your balances and scales meet your own accuracy requirements and adhere to quality standards such as ISO, GMP and GLP.  Our trained weighing professionals can help you determine the best-fit device to fit your application needs and recommend test weights and routine services that will ensure continued accuracy of your industrial scales and systems.