Table 3.

Comparison of Humidity Sensors.

Working Principle	Sensor Name	Sensitivity (%RH)
Optical	Tungsten Disulfide Sensor [53]	35–85
	Tin Oxide-doped Optical Sensor [54]	20–90
	Agarose-doped Polymethyl Methacrylate (PMMA) Sensor [55]	50–80
Electrochemical	Single-walled Carbon Nanotube-based Humidity Sensor [56]	20–80
Chemical	Electroceramic-Based Sensor [57]	33–95
Capacitive	Capacitive-based Humidity Sensor [50]	NA
	Alumina-based Cross-capacitive Humidity Sensor [51]	0–90
	Multi-walled Carbon Nanotube Capacitive Humidity Sensor [52]	11–97