You can make a sensor out of two pieces of scrap wire. Perhaps you can give more info on what you are looking for. Sparkfun seems to be generally reasonable on their prices. You can also try a google search for your sensor.
You can make a sensor out of two pieces of scrap wire. Perhaps you can give more info on what you are looking for. Sparkfun seems to be generally reasonable on their prices. You can also try a google search for your sensor.