Negative Positive
Title: The yellow box is worthless.
Review: All a water level is, is a clear plastic tube with something to close off the air at both ends - you have to remove them to get the level but it keeps the water from leaking out of the tube, or air bubbles from getting in, when you're shlepping it around).Zircon added a totally unnecessary idiot box (light & buzzer) to "help" you find the level and thereby jack up the cost of this gizmo. I couldn't get it to work with the yellow box, eventually got frustrated and removed it. The tubing by itself (and water once you get the bubbles out of it) worked great thereafter. Bottom line: do not waste your $24 on this thing. Go down to Home Depot, buy 20' of 3/8" clear vinyl tubing, clamp off the ends with a couple of those black springy binder clips from your office, and add a little food coloring to the water to make it more visible. Five bucks tops if you steal the clips from work.
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