I use a dowel from the hardware store. I did not seal it and have not had any issues. I keep it dry when not in use.
In case you're using stainless and haven't seen this thread yet, here's another option: https://www.homebrewtalk.com/f257/how-add-permanent-volume-markings-kettle-illustrated-463099/
I used this method on my HLT and it works awesome.
Thoughts on using polyurethane to seal a wood dip stick for volume measurement? I know the stuff is waterproof and wouldn't think anything would leach out after dried.
I just used a permanent marker on my dowel. Yeah I'm high tech like that.
I notched mine with a chainsaw file AND marked it with a Sharpie! GMTA!I use an unfinished stick of wood that I notched with a hacksaw one side for my 10 gal kettle the other side for my 5 gal pots. Hundreds of batches without issues.
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