We have a moderately large (60 gallon) planted aquarium in our living room. For a long time I've wanted a way to watch the water temp as we fill the aquarium. Our normal method involved one person adjusting the valves on the sink and the other feeling the water coming out of a hose 25' away.

I used the lathe to make this simple aluminum tube with hose barbs at each end. A liquid crystal thermometer is stuck onto it. It gives instant reading of the fill water temp and didn't take long to make.