We've already talked to the A2LA auditors before about putting the logo on accredited equipment we send out to the customers and they told us not to, and we don't, even though we have seen others do it. But many of our customers who want accredited calibrations specify that they have to have a certificate showing the A2LA or NVLAP logo on it, which we do provide for them.
What I meant is that we would use the logo on our own in-house standards to identify which items have the uncertainties that are reported on our scope. Example: Standard A has it's uncertainties listed on our scope. Standard B tests the same parameters, but is not quite as accurate. A customer requests an accredited calibration on a unit that is normally calibrated by standard B, therefore we'll use standard A instead. Having a logo on Standard A would be a quick way for the technician performing the calibration that it is listed on our scope. Maybe to avoid confusion, we should just use a big "A" sticker instead. But then it goes back to denoting reference and working standards as well as ones used to perform accredited calibrations, and wanting to know what others are doing, in order to get some ideas on a similar identification method for ourselves. For instance, a nuke plant I worked at one time used white labels for routinely calibrated standards, yellow for limited use calibrations, blue for no calibration required, red for calibrate before use, etc., and then I thought we could further that by using separate labels to denote primary standards (by primary, I mean our highest level in-house standards), working standards, which ones are listed on our scope, etc., but didn't want too many messy stickers all over our equipment.