After a brief 3.5 day trip from BF Montana to Eastern Michigan, I'm back. Big whoop! How 'bout those Chicago commuters! Never again as long as I live will I take the 80 anywhere near that city. Trains only, thank you. You measure the amount of oxygen (%), not the nitrogen purity or amount - can't be done. The oxygen content should be as specified for the type soldering you are attempting. Usually, below 20% oxygen content is acceptable. MoonMan --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------