All the reconnaissance operations and other measurement operations related to dealing with risks or operations of dealing with air flows need to use manual devices with different detection techniques, and these devices must be in an excellent technical condition than they are used for direct interaction, to maintain this required technical level, these devices must be subject to Periodic examination and testing to determine the level of its ability to produce reliable results. The technical center in Emaan Company, which holds the ISO certificate No. 17025 for testing and calibration in laboratories, is able to technically deal with manual reconnaissance devices and other measuring tools and supplies through testing and determining the technical level and the clear need for maintenance, repair and calibration and doing what is necessary to rehabilitate the devices and raise the operational technical level to reach the optimum required level for obtaining good results and follow-up on that.