This Fujifilm Prescale 4.2" x 3" sample, sold by Sensor Products Inc., is a unique pressure indicating film that reveals both pressure distribution and pressure magnitude between any two contacting or impacting surfaces. Fujifilm Prescale is a thin sensor film that instantaneously and permanently captures a pressure profile "snapshot" by virtue of its "changing color." Conceptually similar to Litmus paper, the color Fujifilm Prescale turns is directly proportional to the amount of force applied. The pressure range for this specific product is 350 to 1,400 PSI (25 to 100 kg/cm²) and the dimensions are 4.2" by 3". We have other ranges and lengths in stock. This sample is one-time use and cannot be returned.