When the word Precision engineering is typed in via an internet search engine, multiple definitions / descriptions get forward. Briefly stated Precision engineering is a discipline in mechanical engineering. Precision engineering is a collaboration of electrical engineering, software engineering and mechanical engineering. Common names in this field are MEMS (microelectromechanical systems), NEMS (Nano Electro Mechanical Systems) and Optoelectronics. This discipline searches for mechanical solutions with possible deployment of electronics and software applications to achieve results with high accuracy far into the nano level. The aim is to (fully) predict the (mechanical) system.
In other words, the machine or instrument obeys exactly the cause and effect relationship (within the capabilities of understanding and control) in order to eliminate random effects of its behavior. Everything happens for a reason and now the reasons are small enough to square off.