Our good practice guides are a practical and informative series of documents designed to meet the needs of industry. They are a user-friendly way to find out about what to measure, how to measure it and how to understand the results. Based on NPL's expertise and experience, our guides will enable you, your customers and your suppliers to be in agreement on measurement issues.
Download our most recent and popular guides free of charge by clicking on the relevant guide below. Alternatively, you can search through all our guides via the link below.
All good practice guides
An introduction to measurement uncertainty, the sources of uncertainty and good practice for reducing it.
This guide has practical information on the use of callipers and micrometers for internal, external and depth measurements.
This guide covers the selection of the number of measurement points when using Co-ordinate
Measuring Machines and gives advice on the compromise between accuracy and
This guide is for those who need to make dimensional measurements
but are not necessarily trained metrologists. An introduction to length units and key issues such as traceability and uncertainty.
The aim of this Good Practice Guide (GPG) is to provide an overview of some of the issues
associated with making accurate elastic modulus measurements from static and dynamic tests.
This guide aims to explain how a mechanical engineer’s measurements relate to
the national standards and to encourage good measurement practice to help make the best measurements possible.
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