Versatile "space pen" writes clearly on wet, greasy, and other hard to mark surfaces.

• Compatible for writing on otherwise hard-to-mark surfaces
• Can be used underwater or in extreme temperatures
• Writes on dry paper as a standard ballpoint pen

For use on wet labels, in water baths, liquid nitrogen, freezers at –20 °C (–4 °F), on filters while processing underwater-based buffers, for marking slots on Southern, Northern, and Western blots or on vertical surfaces.