1. Assesment of the documentation.
2. Assesment of the operation of the instrument against requirements (which are usually based on international recommendations published by OIML).
3. Performance testing to ensure that the instrument performs as intended (i.e to within allowable maximum permissible errors) over a range of environmental and usage conditions specified in the requirements.

Pre-packaged Product is defined as any commodity that is enclosed in a container or wrapped in any manner, and for which its quantity has been determined and indicated on its label prior to being offer for sale. The quantity of the product contained cannot be changed without the pre-package being opened or doing a perceptible modification. Once Pre-packaged Products Regulation is enforced under Weight and Measures Act 1972 by Ministry of Domestic Trade and Consumer Affairs, all products which fall under this category are required to comply with Average Quantity System (AQS) and no longer based on current practice which is based on Minimum Quantity System.