I use this type of force tester: http://www.qualityforcegauges.com/force-gauges/ I’d like to ask you how I can replace some accesories to force gauges. I mean what type of tools (grip) I can use instead of chrome vise grip?. I need use some grip to make an analysis of materials strength (like a leather, jeans etc.) for my study but I don’t have any idea what type of device use to grip materials with fore gauge. Have you any idea?