Accurate Weighing through GWP® – The Global Weighing Standard

Accurate Weighing through GWP® – The Global Weighing Standard


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  • Date: 08 Sep,2023

Good Weighing Practice™ (GWP®) is the science based global weighing standard for the efficient life cycle management of weighing systems. It ensures consistent accuracy, quality and compliance in any weighing process. GWP’s risk-based approach ensures that all your weighing devices meet your own accuracy requirements and adhere to quality standards such as ISO, GMP and GLP. It is applicable to new or existing weighing devices from any manufacturer in any industry or workplace.

Regular verification and control of weighing equipment is an essential part of ISO, GLP or GMP quality management systems, ideally conforming to a risk management process. It ensures that instruments continually perform to a high standard, meeting specifications and fulfilling current regulatory demands. This requirement is made clear in the OECD (Organisation of Economic Co-operation and Development) publication “Principles of Good Laboratory Practice, Chapter 4.2: Use, Calibration, and Maintenance of Equipment“, which states that ‘Apparatus used in a study should be periodically inspected, cleaned, maintained and calibrated according to Standard Operating Procedures (SOPs).

It is the responsibility of test facility management to ensure that instruments are adequate and functioning according to their intended use’. The US Pharmacopeial Convention takes this one step further, with “USP Chapter 41” recommending the adoption of a risk management approach to scheduled calibration and routine testing of weighing equipment.

The first, and essential, step in any laboratory application or workflow is to ensure that all balances are correctly calibrated and routine testing of equipment is up to date; optimizing maintenance procedures and balance verification intervals will help eliminate inaccurate readings and reduce downtime.

Generally, laboratory balances are checked on a regular basis for any deviation in sensitivity – the difference between the calibrated weight and the displayed value, ideally measured at the maximum capacity of the balance – and repeatability, defined as the standard deviation of 10 measurements of a weight below 5% of the capacity of the balance.

Further testing, including linearity and eccentricity, is best performed by a fully trained service technician during annual / biannual balance calibration procedures.

METTLER TOLEDO developed GWP®, Good Weighing Practice™, as a standardized scientific methodology for secure selection, calibration and operation of weighing equipment.

Benchmark Your Quality Management System

GWP® Verification helps you assure accurate weighing results as part of your quality management system. Applicable for all balances and scales, it provides an optimized testing and calibrating scheme which may translate to sustainable time and cost savings.

Your Benefits

  1. The accuracy of your weighing instruments is matched to your process tolerances.
  2. A comprehensive summary report provides an overview of the status of all weighing equipment.
  3. An optimized routine testing and calibration schedule results in sustainable cost savings.
  4. Audit-proof and up-to-date documentation complements your quality management system.

For your success: you focus on your process, we take care of the measurement.


METTLER TOLEDO is a leading global manufacturer of precision instruments. The Company is the world’s largest manufacturer and marketer of weighing instruments for use in laboratory, industrial and food retailing applications.

The Company also holds top-three market positions for several related analytical instruments and is a leading provider of automated chemistry systems used in drug and chemical compound discovery and development. In addition, the Company is the world’s largest manufacturer and marketer of metal detection systems used in production and packaging. Additional information about METTLER TOLEDO is available at

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