Simply put, the GX-6000 is a game changer. This powerful hand-held PID gas monitor is capable of simultaneously monitoring up to 6 gases. 6 Gas Monitor, PID gas monitor with simultaneous detection and display. Dual VOC display with 2 PID sensors installed. Monitor the standard 4 confined space gases which include combustibles, O2, CO, & H2S as well as carbon tetrachloride, acrylonitrile, chloroform, methanol, refrigerants (R-143, R-132A), and more. GX-6000 has 2 additional smart channels that accept PID, IR or super toxic sensors.