re: pH Probe Costs Sven, >>I only found very expensive pH-probes though. Does anyone >>know of a good one, and at what appr. price? Hate to ask this, but how expensive is expensive? I've found several starting a $79.00 up to several hundred dollars. Will the probe be run in line? If so I have found one with a flat electrode that is designed to stay clean for I think $115.00. Doug