SENSOR
Sensor is a device, module, machine, or subsystem whose purpose is to detect events or changes in its environment and send the information to other electronics, frequently a computer processor. A sensor is always used with other electronics.

Temperature Sensor
Measure the amount of heat energy that is generated by an object or system, allowing us to “sense” or detect any physical change to that temperature producing output.
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Pressure Sensor
A pressure sensor is a device for pressure measurement of gases or liquids.
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Gas Sensor
Gas sensors are electronic devices that detect and identify different types of gasses.
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Proximity Sensor
A proximity sensor is a sensor able to detect the presence of nearby objects without any physical contact.
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