• Smallest & lightest 4 in 1 gas detector
  • Simultaneous detection of 4 gases
    LEL, O2, H2S & CO (Dual Sensor)
  • Simple 2-button operation
  • Alarms: audible, visual, & vibration
    (all 3 alarms setpoints can be adjusted by the user)
  • Impact resistant body with removable rubber boot
  • Large LCD Auto-backlit display
  • 25 hours of operation (Lithium-ion battery)
  • Field replaceable sensors & filters
  • Water and dust resistant design, IP66/68
  • *3 Year warranty


MODEL GX-3R | 4 in 1 Gas Detector | Portable Industrial Gas Detectors

The GX-3R is the world’s smallest 4 in 1 gas detector that is easily portable and can be clipped within a worker’s breathing zone. It simultaneously monitors and displays LEL combustibles, O2, CO, and H2S.

The GX-3R represents the latest evolution of gas detection technology utilizing a new generation of micro sensors. The LEL detector has a unique design with two active filaments in one sensor to increase its resistance to silicone poisoning. If one filament gets poisoned, the second filament takes over, making it a reliable gas leak detector in hazardous environments. The new O2 sensor is electrochemical with a 3 to 5year life span. H2S and CO gas detection are now available in a combo micro sensor.

Safety supervisors will appreciate the non-compliance indicator. The instrument flashes its 3 LED lights every 30 seconds in the following conditions: if the instrument has not been bump tested, if the calibration is due, or if there was a gas alarm event. The 3 LED lights will continue to flash once every 30 seconds until the non-compliance condition is resolved. The 30-second interval is adjustable.


The GX-3R can be used for:
  • O2 & H2S monitoring while working at construction sites
  • LEL monitoring in gas plants and during installation of gas pipeline/meters
  • O2 gas leak detection at shipyards
  • CO monitoring in steel plants


To learn more about the GX-3R 4 in 1 gas detector, click here for our catalog