> Still, if the volume advertised is greater than the chamber and the > waveguide, I can't see the point, and it would appear to be more > of a sales technique Well, that's what I'm trying to find out about. If something is advertised as 23L and it's not, how can they do that ? I'm not exactly on a crusade, just very very curious, and it's a matter of principle now as to why the relevant ministries can't or won't get it Joe ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2016.0.7688 / Virus Database: 4627/12683 - Release Date: 07/25/16 --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .