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			 ANyone familiar with these? Or a better, less expensive option? 
		
	
		
		
		
		
			W.E. Anderson OLS Level Switch, the cheapest optical ones I could find. I would like to add a couple of these for fail safe shutoff for my RO tanks. Charles 
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	Where did my rum go?! Success in this hobby does not count how you spend your money, it counts how you spend your time.  | 
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			 we use something like this for our swimming pools in the surge tanks. the only thing I can say is you will have to run it in a tube or something because the laser can bounce off debris or items and cause and incorrect reading. I just use cheap float valves myself and never had an issue. 
		
	
		
		
		
		
			
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	150 gallon reef mostly softies/lps. 50 gal sump with bubble magnus skimmer/ Led fuge light/refugium/ 1200 return and tunze powerheads. Dual pharoah main tank led.4 pump dosser. 550 gallon stingray tank water drip system 150 bowfront. 75 turtle tank, many others  | 
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			 I ended up making my own. 
		
	
		
		
		
		
		
	
		
		
	
	
	Digikey has a decent article on it. I used it do design mine. http://www.digikey.ca/en/articles/te...nic-techniques  | 
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