I don't recommend going the Meseran route. I inherited one in a previous life. I found that the gauge R&R for the instrument was unacceptable. The instrument drips a solvent containing an isotope onto the mask surface, vents it for a while and then measures the trace radioactivity which should be proportional to the amount of solvent that absorbs into the mask. An undercured mask should absorb more than a fully cured mask. We were seeing more variation in readings than we expected since our curing process was calibrated by other instruments for both temperature and time. To determine the viability of the Meseran, we tested a piece of plate glass repeatedly as a set-up tool, thinking that no mask would be as impervious to solvent absorption as glass. We not only got unexpectedly high readings but we got unacceptable variation in the readings. At that point we decided to concentrate on oven calibration and quit sending money to Meseran. ################################################################ 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 ################################################################