So are you saying that you simply keep the buffer solution in a bottle and open it to check/calibrate the meter periodically or before using?
Alan On 2014-10-03, at 17:32 PM, John Popelish wrote: On 10/03/2014 06:03 PM, Alan Faulkner wrote: > Thanks John. I wonder if the calibration would be an > issue with the electronic one? > > The strips are cheap but sometimes very difficult to read > and this makes them a very rough indicator. > > Also one of them (the third down) does not include the > batteries. (snip) >> Digital pH meter pens gave come way down in price since >> I bought one a decade ago. for example: >> http://www.ebay.com/itm/221550766554 >> >> http://www.ebay.com/itm/111419587528 >> >> http://www.ebay.com/itm/141364077523 >> >> http://www.ebay.com/itm/191251467428 >> >> But pH paper is cheap, too. >> >> http://www.ebay.com/itm/160-Full-Range-pH-1-14-Test-Testing-Indicator-Paper-Litmus-Strips-Kit-Universal-/201070668843 >> >> >> http://www.ebay.com/itm/pH-Strips-1-12-range-vial-100-strips-Test-Paper-Litmus-Pool-Acid-Base-/271226943693 They >> sell buffer calibration solutions and salt packets you dissolve in distilled water, to check and adjust the calibration. I think the second one, above comes with two buffer packets. Replacements are cheap and plentiful. Buffers are solutions that hold a fixed pH value, in spite of considerable contamination. Probably the worst thing to use to check calibration is very pure water, since its pH can be shifted by dipping the tip of your finger in it. It is the opposite of a buffer. The batteries they use are very common types. that are very cheap. The EC meters use these, and I think some of the pH meters do, too. http://www.ebay.com/itm/AG13-LR44-LR1154-SR44-A76-357A-303-357-Alkaline-Coin-Cell-Button-Battery-AE-/111433131955 -- Regards, John Popelish -- The Silver List is a moderated forum for discussing Colloidal Silver. Rules and Instructions: http://www.silverlist.org Unsubscribe: <mailto:[email protected]?subject=unsubscribe> Archives: http://www.mail-archive.com/[email protected]/maillist.html Off-Topic discussions: <mailto:[email protected]> List Owner: Mike Devour <mailto:[email protected]>
