AZDelivery 5 x MQ-135 MQ135 Air Quality Gas Smoke Detection Sensor Module Compatible with Arduino and Raspberry Pi, Including E-Book!

This sensor arrived exactly as expected and was accompanied by an e-mail from Markus providing full usage details and datasheets.It only took moments to get the sensor hooked up to an arduino and working.Excellent product and service.

Can print pretty graphs using this sensor as an input.