"widely" (l.19) can be correctly substituted for largely.

"In addition" (l.7) means Furthermore.

not always does the number of transduction mechanisms determine whether the sensors are to be defined as direct or indirect.

sensors and transducers are labels which can indifferently be used either for one or for the other as both have the same mechanisms.

just four are the words which can be used as synonymous with sensor.

Sensor applications and sensor engineering can be considered fields of knowledge where trials should not be allowed.

It's possible to go to length of saying that cheap sensors are increasingly being used in every type of consumer products.

There has always been the need for sensors in medicine and science.

The demand for sensors capable to produce an electronic signal came together with the arrival of the microprocessor and computers.

There are no measurement and control systems whatsoever which would take sensors as a useless device.