This is the system followed to inspect and ensure the serviceability of tools, equipment periodically (normally it is monthly) like fire extinguishers, full body harness, lifting gears electrical codes and cables, power tools, etc., These things are inspected by competent person and are indicated by putting the colour of particular month.(The colour is decided in advance and it is being used by all persons in site). The items which are found defective and unserviceable will not be colour coded and has to be removed from service.