Our experience in metrology and support from manufacturers, along a solid cooperation with Primary Institute Galileo Ferraris, led us to accreditation for optical fiber photometrical measurement unique for its kind, because we can provide an accredited SIT calibration certificate for all types of otptical instruments, like Power meters, Attenuators, Sources, and within a few time, OTDRs. For Power meters, calibration of absolute power and flatness from 850 nm to 1550 nm is performed. For variable and fixed point Attenuators, loss insertion and step attenuation calibration from 850 nm to 1550 nm is performed. For Sources, short time power stability calibration from 850 to 1550 nm is performed. Our target is to satify all customer requirements giving also support for instruments maintenance.