Subject: pH meters
We have recently investigated the new pH meters & discussed our pH needs with Jim Osmun, a representative of Orion Research Company, makers of pH kits & accessories. The development of digital pH meters, the improvements in accuracy & reproducibility in these meters & the development of a new electrode all contribute to major advances in taking pH measurements. We were impressed with the relatively inexpensive pH meter that seemed to meet all our potential needs & more. This was the Orion model SA250 portable pH /mv temperature meter (for active environments)(that's us!). It includes automatic temperature compensation & is pre-programmed to automatically in buffers at pH 4, 7, & 10. It is accurate to 0.01 pH units & comes complete with electrode, carrying case, accessories and instruction manual. The Ross electrode is a new development in electrodes. The manufacture model # is 8135BN and the catalog # in American Science is H4100-14. We ordered the meter through American Science & were able to substitute the above electrode for the one normally supplied with the meter. We got all of these items and a free promotional item, a nice benchtop stand for the low, low price of $495. There are many inherent problems with reading pH from the surface of paper and these were underscored in our visit with Mr. Osmun. However, for taking pH measurements--whatever they might mean--this is a very nice metering system. We will send you more information in the near future. Hope all is well, sorry we haven't been answering our mail. (yes, we are here) but we have been having technical difficulties. robert *** Conservation DistList Instance 1:1 Distributed: Tuesday, May 17, 1988 Message Id: cdl-1-1-001 ***Received on Wednesday, 28 October, 1987