Hi Bob, Yes, I understand. However, the standard solutions were part of the package provided by Hanna. The problem was that the readings were NOT repeatable nor were the results ANYWHERE near the known results which were obtained from Kimball Labs. The unit did not work on CS....period. End of story.
PWT's work much better even if they do not measure the colloidal portion. At least they can be calibrated with a correction factor to get the total PPM and the readings are very repeatable. That's what counts for me and I think for the average user. I'm not interested in measuring CS to the Nth degree. What I am interested is knowing roughly what the PPM is and I want it to be fairly accurate and repeatable. That's what I get with the PWT. As I have mentioned, we use three of them to average the readings when calibrating our generators and to check against each other. They are almost always the same as far as readings go....within one point or less usually. Why do you denigrate a very useful tool when it is so inexpensive to buy and also easy to use. Trem ----- Original Message ----- From: <bober...@postoffice.swbell.net> To: <silver-list@eskimo.com> Sent: Wednesday, December 26, 2001 10:46 AM Subject: Re: CS>Measuring CS strength > Hi Trem, > > I do not care whose spectrophotometer one uses. It must be calibrated vs a > known standard. > > You might go to the public library and get the video made by UCLA of > spectrophotography. It give a very good explaination of how it works and what > is required to calibrate one. > > Mine is make by Hach and I use there chemicals but it still had to be > calibrated as wach mahine has its own idiosyncrasies. > > "Ole Bob" > > > > > > > > > > -- > The silver-list is a moderated forum for discussion of colloidal silver. > > To join or quit silver-list or silver-digest send an e-mail message to: > silver-list-requ...@eskimo.com -or- silver-digest-requ...@eskimo.com > with the word subscribe or unsubscribe in the SUBJECT line. > > To post, address your message to: silver-list@eskimo.com > Silver-list archive: http://escribe.com/health/thesilverlist/index.html > List maintainer: Mike Devour <mdev...@eskimo.com> > > > >
