1. Global Specs Inc., About tilt sensors and inclinometers, Available from: , 2004.
2. W.B. Powell, D. Pheifer, The electrolytic tilt sensor, Available from: , 2004.
3. Spectron Glass and Electronics Inc., Electrolytic tilt sensors, Available from: , 2004.
4. Planet EE Network, Electronic design, Available from: , 2004.
5. The PI-Polytec Group, Capacitive position sensors/controllers, Available from: , 2004.