Physical Data type and some examples

There are sensors for every type of physical data.
This makes it posible to record most events:
  
Physical Data type             Example of data Logging

Electrical                            Taxi meter, Traffic lights.

Pressure                              Burglar alarm, Traffic census.

pH                                      Adicity of a chemical in manufacturing.

Light                                  Biometrics-authentication at airports, counting preople.

Magnetic                           Security door access crontrol.

Temperature                      Weather station.