We use a contract auditor to do our internal audit since we are a very small shop. During this last audit, the auditor wanted to look at 3 calibrated tools. One of the tools (a caliper) could not be located. The auditor is saying that is a non-conformance because the tool register is now out of date. I have records showing that this tool was used less than 5 days earlier. That is leading us to have to establish a process to make sure no tool was lost at the end of each day. But what would happen if the tool was lost on the morning of the audit? Do I now have to place RFID trackers all the tools so I know where they are at all time?