The RKI GX-3R Pro is a very small 5-gas monitor, weighing only 4.58 ounces and fitting in the palm of the hand (2.9 in W x 2.6 in H x 1.06 in D). It monitors and displays 5 gases at once: the standard confined space gases (LEL, O2, CO and H2S) plus a fifth channel for an infrared or toxic gas sensor. Two of the four sensor slots take interchangeable sensors, so configurations can be changed easily in the field.
It communicates over Bluetooth with an iOS and Android app.






