Rite in the Rain Mechanical Pencil
With Rite in the Rain mechanical pencil may well be the last pencil you will ever need to buy. They have been made to survive, so they are well suited for geocaching. It has thick lead that won't snap at the tip and a patented tip that expands so lead won't break, wobble, twist or fall out.
This pencil will write on soaking wet Rite in the Rain paper or logbook. The pencil comes with 6 extra leads (1.1mm HB) and 2 extra erasers.