not sure what's that and how it works, google it and seem it's likely labeling printer for price tag etc. do u have any sample which it can use for labeling dive gears which is waterproof?
the label makers are available at most office supply stores, but be sure to get weatherproof lables, I have had weatherproof labels on my tanks for a couple of years, and they have hardly degraded at all. I do like Peter's idea of coating them with clear nailpolish, and by doing it that way, you could probably get away with a weatherproof label printed on a typical inkjet printer (the label printers are a little pricey for good ones).