Hi Richard, Wednesday, June 29, 2005, 12:27:43 PM, you wrote: R> I make a +/-0.01mm reading error equivelant to a +/-9.2mm error R> in the ROC of 3000mm, which gives about 0.31% Sorry, make that +/-109.2mm = 3.6% -- Best regards, Richard in the UK _______________________________________________ ATM mailing list http://www.atmlist.net/