Pencils will work great on the Commercial Pool & Spa Log Book but sometimes you just need a pen. This All-Weather Metal Pen writes on wet paper and upside down, the pressurized ink cartridge performs in temperatures from -30F to 250F.
The ink won't leak, evaporate or blow up in your pocket! 5 1/4" long, with a Barrel Diameter of 3/8". Black ink.