We have a wide range of sensor in the low cost.
We have all kind of sensors like Proximity sensors (In the standard dimension), Photoelectric sensors, Diffuse sensors, Optical fork sensor, Color mark sensors, Fiber optics sensors, Thru- beam sensors, Level sensors, Ultrasonic sensors etc.
We have all brand of the Sensors which are Lead in the Automation Industries now a days:
A sensor is a device that detects and responds to some type of input from the physical environment. The specific input could be light, heat, motion, moisture, pressure, or any one of a great number of other environmental phenomena.