The most accurate are probably the digital/electronic's if you have the bucks. I just changed out the media, kind of a PITA, good thing my girlfriend only see's about half the water I spill 
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60 Gallon rimless, internal Herbie overflow, ATI Powermodule, Eheim 1250, 2X Tunze 6055, Tunze ATO, Euroreef RS100, Profilux controller, TLF Reactor.
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