richard@gryphon.COM (Richard Sexton) (01/05/90)
In article <5888@ncar.ucar.edu> cruff@handies.UCAR.EDU (Craig Ruff) writes: >In article <5985@alvin.mcnc.org> bing@mcnc.org (Carter E. Bing) writes: >> I saw one of these the other day for about $69 (which >> is to steep for me) and I was wondering if anyone has purchased >> one? Are you pleased with it? > >I picked one up from Edmund Scientific for $89. It seems to function >as advertised. I calibrated it with a buffer solution (pH 7.0 @ 25 deg. C) >which is close enough to conditions in my aquarium to provide confidence >in the readings. I'll probably use it more often than I used chemical >indicators with better results. It only takes a few seconds to get >a reading. Ron Harlan sells these things for $65; he also has hardness meters (which are actually conductivity meteres) for the same price. It's actually pretty easy to talk him down to $50 :-) And now the the reason for the massive x-post. Does anybody know if it's possible (and feasible) to build meteres for chemicals such as Ammonia, Nitrates, Phosphates, Iron ?