I ask because I'm cleaning out my garage, and found a Chainman device. It's in a red plastic box and reads in metres. I used it once running down lava tubes in Hawaii, maybe a couple times solo survey in Roppel Cave.
Anybody have a use for this thing? Is it worth anything, or should I just chuck it? I have a few rolls of thread with it as well.
Cheers, eh?
Pete Zabrok