When I saw the reviews, I was thinking about not buying this but i decided to try it out. When I tried it out, it worked great. It told me when the water was perfect so that i didn't have to put my hand in the water every 10 seconds to check the temperature. Two weeks later, the lights stopped working, I started to freak out, but i unscrewed the whole thing and waited a couple of days and put it back on, and it began working great again. Great item but you might have some problems so don't expect this thing to last forever. :/