Kathy It appears you are using the original manual method. We have updated the IPC method which deals with the necessity of a nomagram for each conductivity meter. If you want I can fax you the method that tells you how to prepare a nomagram. That way you have a graph which will tell you the sodium chloride equivalents based on the reading you get from the test solution. We do this test routinely and agitate the entire time the sample is in the solution. It does provide a reading and is good for most assemblies. Large surface mount components with little clearance do present a concern as they do for assembly cleaning operations. Call if you want to talk or want me to fax the method. Susan Mansilla Technical Director Robisan Lab 317-353-6249 ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################