In order to adapt to the world economic crisis, companies must remain competitive, while limiting cost and expenses as much as possible. It is therefore important for these companies to grasp this as a strategic concept and not as cost constraint. Establishing simple but well-targeted measures can help limit difficulties and make a company more productive with low costs. These specific measures allow clear improvement in performance whatever the field of activity. Metrology, the science of measurement, is intrinsically linked to all human, scientific, industrial and commercial activities. We can call on it for every day use. The role of metrology is constantly increasing and affects sectors as vital as energy, hydrocarbons, health, communications,  agri-business, pharmaceuticals and the safety of industrial facilities, workers and the population as well as environmental protection. One of the traditional qualities that describes a good salesperson (manufacturer, trader) is known for her or his ability to adapt to a market. In a market where pre-packaged products are more and more available; one of the quality factors of a pack marked 500g will be that it actually contains 500 grammes of product. For this reason, measuring instruments (in the manufacturing chain) must be regularly calibrated and verified. All this equipment has an impact on product quality, safeguarding the facility and preventing occupational hazards and environmental pollution.  For the business, mastering the these instruments is therefore necessary, on the one hand internally to master the product manufacturing procedures, assuring personal and plant safety and to conserve the environment; and on the other hand externally to  Knowing how to use measuring instruments is necessary for all companies. This will help inside the firm to master the manufacturing of the product, ensure the safety of people and installation, and also preserve environment safety; externally to prove that the measures are understood (through an audit) and allowing the products to be positioned on international markets.