I like catching glimpses of useful information in the show Treehouse Masters. One that always catches my eye is the water level. It’s a simple piece of clear plastic tubing filled with water. As long as there are no air bubbles in the tube, the water will always rise to the same height at both ends of the tube. This simple science fact means that you can find the same height across great distances and uneven ground. I have a laser level which is good for this but it doesn’t go very far, especially in the daytime. And oh yeah, it’s a lot more expensive than a clear plastic tube.
I recently used this technique to figure out how high we need to raise up the corner of our yard to match our patio height (33”). I imagine we’ll use this at some point in the fence building project too.