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Image 6 of 10

Calibrating Sight Glass

In the third pic I hope you can see the calibrated sight glass on the HLT. I simply covered the glass with Scotch tape and poured gallon jugs of water into the HLT, marking off gallon increments with a Sharpie pen. I decided that one gallon increments were sufficient; it's easy to estimate quarts between the marks and I don't think any greater precision is necessary.