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Carol, some of these tools (the majority) of them are used for incoming / receiving insp., the rest are like you say basically used as reference tools. The concern I had was for the gages / tools used for product acceptance. I am going to do the calibration on the micrometers and calipers for the shop floor, and front office . The ones on the shop floor I will do annually, the ones in the front office will be done every two years. Most of what we measure here are steel tubes we have a tolerance of +/_-.060 to +/-.125 so most of the measuring tools used in the shop are tape measures, that I check annually to make sure they are ledgible and accurate.