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→Force Sensing Resistor
[http://www.trossenrobotics.com/store/p/3221-1-5-Inch-Force-Sensing-Resistor-FSR-.aspx purchase]
Good for physical interfaces (my ex this project: http://roberttwomey.com/hitme/)
[http://www.trossenrobotics.com/store/c/2670-Force-Sensors-Pressure-Touch-Sensors.aspx more force sensors ]