What is the best float switch out there?

I really like the Reef Fanatic dual level controller. It has a couple of nice features. Dual switches to prevent a failure. The switch is very sensitive so that a very small drop in level kicks it in. This is important when you are using limewater topoff. It also has a hysteresis window so that the topoff pump doesn't constantly turn on and off.
 
Thanks guys. I like the dual switch controller like the reef fanatic or the autotop off. Where do you find the reef fanatic or the tunze osmolator?
 
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