The Weighing Standard - METTLER TOLEDO

Standard 1: Metrological guidelines, such as OIML R76-1 and HB44, define the minimum requirements for an approved weighing device. Considering that their purpose is just to set a legal framework to commercial transactions, they lack the guidance you need for your specific process requirements.

Standard 2: Quality standards  such as, ISO, GMP, GLP, USP, HACCP, GFSI based and others, require continuous equipment monitoring. For example, ISO 9001 states: “Measuring equipment shall be calibrated or verified, or both, at specified intervals…" Because of its generic scope, however, ISO does not give you any specific information on its implementation .

Standard 3: GWP® documents that the weighing equipment fulfills the measurement accuracy requirements on the basis of on-site calibration and measurement uncertainty determination. This closes the gap left open by OIML/HB44.  Furthermore, GWP® helps you determine the specific methods and frequency of the regular calibration and verification tests required by the quality standards (ISO, GMP, GLP, etc.).

A GWP® certification provides an audit trail, proving that you comply with both external requirements and your (often more demanding) internal quality management (e.g. six sigma and lean manufacturing). GWP® helps you build exact metrological standards while ensuring that your resources are invested only in appropriate activities. Not more. Not less.

Scientifically, transparently, exactly. GWP® can be applied to all balances and scales of all brands and models.


METTLER TOLEDO offers two unique service products based on GWP®:

GWP® Recommendation for evaluating the appropriate balance or scale for your requirements
GWP® Verification for certifying the accuracy of your equipment  in use (brand independent)

The GWP® risk-based methodology covers the entire life cycle of a weighing device in five steps:

Understanding your weighing process

The GWP® standard helps you in evaluating your weighing requirements in a simple and objective way.

  • Use a clear set of criteria to document metrological, environmental and regulatory requirements.
  • Receive a GWP® Recommendation that summarizes your require-ments in one piece of documentation.

Optimal match
for perfect quality

You select the right balance or scale meeting your weighing requirements - not more, not less.


  • Purchase only equipment with a suitable accuracy to meet your process and quality requirements
  • Environmental and regulatory factors are considered before the purchase

Proper installation
and configuration

Professional installation, and qualification of the weighing system along with in-depth user training ensure trouble free weighing right from the start.

  • Immediate readiness of users and instruments from day one
  • Documentation traceable to national or international standards

Confidence in having the relevant documentation

Document the measurement uncertainty and minimum weight of your weighing equipment to assess its performance on site.

  • Assurance that balances and scales weigh within process tolerances
  • Audit-proof documentation

Optimized testing minimizes risks and costs

A risk-based test scheme allows you to invest resources where it really matters.

  • Clear recommendations for routine test methods, test frequencies, test weights and pass/fail limits
  • Only perform meaningful tests and reduce unnecessary efforts


Thank you for visiting We have tried to optimize your experience while on the site, but we noticed that you are using an older version of a web browser. We would like to let you know that some features on the site may not be available or may not work as nicely as they would on a newer browser version. If you would like to take full advantage of the site, please update your web browser to help improve your experience while browsing