Quote Originally Posted by waterbear
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
Hey waterbear I appreciate it. I was in on some discussions last year regarding the ORP meters as well as the pH meters and they seem more of a hassle than it's worth with the calibration and so forth.

Something that has changed between now and then is that my girlfriend now lives with me so testing the pH is much easier