GDM-900 can measrue (1) CO (0  ~ 500 ppm), (2) O3 (0 ~ 10/100ppm), (3) CH4 (0 ~ 10000 ppm). GDM-900 displays the measured data with a 0.96″ OLED display.

GDM-900 can transmit the measured values using (1) MQTT/WiFi, (2) WiFi and (3) LoRa techniques. Method (1) sends MQTT messages to the remote MQTT broker directly. Methods (2) requires MQTT server and method (3) requires LoRa MQTT Gateway to relay the received messages to the MQTT Server. Messages processed in the MQTT Server can be displayed in the remote PC monitor via a private VPN link.