Wilber, I use the Wave Solder Optimizer (similar to the Wave Rider). It measures preheat temperature, and solder pot variables such as temperature, dwell time, left-right parallelism & contact time, wave depth. It has worked out well as a tool to insure the same set-up especially after cleaning (removing the solder nozzle during maintenance). We've set-up control limits on these variables and make corrections as required if the readings are out-of-control prior to running production hardware. Good luck, Al Kreplick Teradyne, Inc. Boston, MA ################################################################ 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 ################################################################