On the other hand, you can make some yourself just as easy, if you have reagent grade sodium chloride and some simple glassware handy. Standardized Solution #3 is 750 ppm of NaCl in deionized water, if memory serves. 750 ppm = 750 micrograms per milliliter = 750 milligrams per liter = 0.75 grams per liter. But, you can't go down ta the local Walmart, buy some Morton Iodized Table Salt and make up the solution. Not pure enough. Don't ask me how I know. On the other hand, Mike's response works too. Doug Pauls Michael McMonagle <mmcmonagle@OYOGE OSPACE.COM> To Sent by: TechNet [log in to unmask] <[log in to unmask]> cc Subject 02/15/2006 09:12 Re: [TN] Resistivity calculator AM Please respond to TechNet E-Mail Forum <[log in to unmask]> ; Please respond to Michael McMonagle <mmcmonagle@OYOGE OSPACE.COM> Fredrik, You can order standardizing solution and other supplies/parts for your Omega Meter from www.scscoatings.com, the division of Cookson that now handles the ionic test equipment.... Mike McMonagle Quality Manager OYO Geospace 7007 Pinemont Drive Houston, TX 77040 Ph 713-986-8650 Fx 713-986-8725 -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Skillborg, Fredrik Sent: Wednesday, February 15, 2006 8:28 AM To: [log in to unmask] Subject: [TN] Resistivity calculator Hello, I am trying to bring life to an old Omega Meter but cannot get hold of fresh Standardizing solution #3. Is there any calculator/table that allows me to use some other concentration of the standardizing solution? The nomgram from the manual only have a "calibration point" for the #3 solution. Maybe this is a question that should have been put 25 years ago when the equipment was new... Thanks in advance. // Fredrik --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------