In many of the software routines used for the testing stretch fabrics we leave the extension range open for the technician to input when they are setting up the test in the settings field. It is important though that you do set a realistic number for the fabric under test, not just enter the maximum allowable. If you get into this bad practise the software may have difficulties when it comes to re-scale on the completion of the first specimen. Our M-series machine users with Qmat Pro must take particular care of this testing by direction with the maximum extension first.