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FSRs are sensors that allow you to detect physical pressure, squeezing and weight. They are simple to use and low cost. Adafruit Round Force-Sensitive Resistor is an Interlink model 402 FSR with 1/2 diameter sensing region.
FSR's are basically a resistor that changes its resistive value (in ohms Ω) depending on how much its pressed. The accuracy changes from sensor to sensor, and around 10% of difference is expected. So basically when you use FSR's you should only expect to get ranges of response. While FSRs can detect weight, they're a bad choice for detecting exactly how many pounds of weight are on them.
Adafruit Round Force-Sensitive Resistor is made of plastic and the connection tab is crimped on delicate material. The best way to connect to these is to simply plug them into a breadboard or use a clamp-style connector like alligator clips, female header, or a terminal block. It is possible to solder onto the tabs but you must be very fast because if your iron is not good quality or you dally even a few seconds, you will melt the plastic and ruin the FSR! Don't attempt to solder directly to your FSR unless you are absolutely sure you have the skills to do so.
Adafruit Website: http://www.adafruit.com/products/166
