I'm working on an idea. I've seen a lot of posts for diy sight glasses, and I'm glad that I'm not the olny tight-a$$ out there. Anyway, my idea is this. 90 degree fitting, compression fitting, SS or copper tubing, and some round boyant material (not sure what yet. Don't think balsa would be the best material). My idea is basically modeled after a tire pressure gauge. The balsa, or whatever, which is calibrated and graduated to fit your HLT, will float atop the water in the tube, and the marks will align with the top of your tubing. I'm gonna experiment, and let ya know how it turns out. Please share any ideas you might have, or just tell me I'm crazy and that it'll never work.
WWJB? (What Would Jesus Brew?)