Wow thanks Ceadman, this might be the one. Do you know how this thing works to understand how many of the accessories one would need to do all the great stuff it is capable of? In the past I've found the probes to be a large portion of the purchase price. On the web site you posted I checked out the accessories and I can't even tell from the descriptions which part is an oxygen probe. I've never used one of these things so trying to figure out what I would really need to do what I want to do is confusing. I would assume for the $399 you get at least the capability to stick the thing into the water and get a reading. But how long does a membrane last, how long does a probe last, what other accessories do you need to record results?
