Optical level sensor/switch

[james77515]

Are there any optical sensors/switches that anyone would recommend for an ATO and an AWC? Something like the tunze switch or the hydrofill switch?

 

[TreyC2010]

I don't know if this is ok so if not just delete this but I had looked at this website for ATO before and it tells you what sensors each of these use. http://blog.marinedepot.com/2014/09/auto-top-off-reviews-ato-buyers-guide.html