This is a handy little tool to have in the kit•It’s a @marxmanpen and it’s non permanent, I believe it just a pressurized chalk.•Great for getting to those spots that a pen or pencil can’t.It’s one of those things I don’t use a lot but when I do I’m super happy to have it.They say you’ll get 250 marks out of each one.They sell for under $15 might even be less then $10....#tools #construction #layout #marxman #engineering | Kruger Construction