The Omegameter’s manual doesn’t have this information. I have found in a paper that “the system is capable of detecting changes in contamination as small as 0.2 parts per billion and will display changes as low as 0.5 parts per billion”. By the way, be sure that the starting resistivity value was lower than 60.35 Megohm centimeter. Regards, Juan T. Marugán López Indra Sistemas, SA Production Quality - Defense Electronic Equipment Madrid (ESPAÑA) www.indra.es --------------------------------------------------- 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 -----------------------------------------------------