The term Civil Aircraft is a very broad term. Under that umbrella, is Commercial Aviation through to home operated ultra light aircraft. Even Commercial covers everything from International/Domestic carriers through to Flying schools using light aircraft such as the Cessna 172.
In the Commercial world, tool control is extremely important, and regulations similar to Military operations are becoming common place. These days, good operators all ensure that every tool and part has been accounted for before an aircraft is released to fly following maintenance.
All measuring equipment needs to be calibrated by a qualified workshop, and all support equipment has to be regularly serviced. Auditors from CAA , FAA, EASA, Aircraft companies all want to see records of the same.
Aviation maintenance is heavily regulated, and most Engineers are highly motivated towards personal professionalism.