To consistently deliver quality heat sealing, it is necessary to maintain uniform contact between heat sealing platens, whether flat or rotary. Pressure indicating sensor film can immediately determine the pressure distribution profile of the heat sealing jaws, allowing a determination of the amount of adjustment needed to realign the heat sealing platens. This tactile surface pressure sensor is a thin plastic film-like material that is placed between contacting surfaces and instantaneously and permanently captures and records pressure distribution by changing color. Similar in concept to Litmus paper, the color change is directly proportional to the amount of force applied and is quantifiable.