The "poor man's" accelerometer! Tilt sensors are switches that can detect basic motion/orientation. The metal tube has a little metal ball that rolls around in it, when its tilted upright, the ball rolls onto the contacts sticking out of end and shorts them together.
Be sure to read our detailed tutorial including diagrams and example code.
Product Dimensions: 23.0mm x 5.0mm x 5.0mm / 0.9" x 0.2" x 0.2"
Product Weight: 1.0g / 0.0oz