Quote Originally Posted by ScottS
Now if someone would come up with a color blind friendly way to read the PH that would be excellent. Although, my girlfriend is very sufficient at letting me know what the PH is

Now please don't spam me regarding ORP meters because from my research they are not near as reliable as I need unless I plan on spending plenty of money!
It's not an ORP meter but a pH meter and LaMotte has a decent one for under $100. I've used it for saltwater reef tanks.
ORP meters measure the redox potential of the water--in -other words, is there any available oxidizer (I won't say sanitizer becuase they will also measure Non chlorine shock) in the water.

check out this thread:
http://www.poolforum.com/pf2/showthread.php?t=289