Flexiforce Pressure Sensor - 25lbs (1" area)
The flexiforce pressure sensor is thin, flexible, it could be used in so many applications, it acts as a presence sensor (someone standing), weight sensor, pressure sensor (impact testing), etc.
However, the basic rule is, whenever you want the resistance to change from infinite to ~50k, press harder, since pressure is what does the magic over here and not the flex!
The overall length is about 2.25". The sensor comes with a 0.1" spaced, reinforced, breadboard friendly connector.
This sensor ranges from 0 to 25lbs of pressure.