A Nellcor N-550B Pulse Oximeter, found at the Royal Hospital for Sick Children in Edinburgh, has come to my bench. It isn't one of ours, but I'm 99.99999% sure it's from somewhere in Scotland. There are NO identifying labels on it (Asset label, servicing label, etc), but someone has written in a permanent marker on it "PCNS 16". The serial number is "0181 0502 XXXX". If you can replace XXXX with the rest of the number, I'll return it. If not, we're keeping it!