RKI Instruments GX-3R 4 Gas Confined Space Kit

$625.60 - $1,380.00
3.00 LBS
Calculated at Checkout
Enhance safety with RKI Instrument's GX-3R 4 gas confined space kit, a highly compact and efficient gas monitor. New microsensors for exceptional detection.
See full description

RKI Instruments GX-3R Four Gas Monitor - the worlds smallest gas monitor

This is a COMPLETE Bundle with everything needed.

Click here to learn more from RKI Instruments website


OSHA defines the breathing zone as a ten inch radius around the worker’s nose and mouth, and requires that worker exposure monitoring air samples be collected in the breathing zone. Air sampling filters may be attached to the collar or lapel.  Traditionally this means only a single gas monitor would be small enough for a worker to practically wear a gas monitor ‘In the breathing zone’. Now there is a 4 gas confined space monitor that’s smaller than many single gas monitors.

The GX-3R 4 gas confined space kit by RKI Instruments features the world’s smallest 4 gas monitor weighing only 3.52 ounces and can comfortably be clipped within a worker’s breathing zone (2.2” W x 2.55” H x 1.02” D). It simultaneously monitors and displays LEL combustibles, O2, CO (Hydrogen compensated CO also available), and H2S. 

The GX-3R confined space gas detector represents the latest evolution of gas detection technology utilizing a new generation of micro sensors. The LEL sensor 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. The new O2 sensor is electrochemical with a 3 to 5 year life span.  H2S and CO are now available in a combo micro sensor.   

Safety supervisors will appreciate the non-compliance indicator. This confined space gas monitor flashes its 3 LED lights every 30 seconds in the following conditions; if the instrument has not been bump tested, or if 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 has been resolved. The 30 second interval is adjustable.

The RKI Instruments GX-3R 4 gas confined space kit has everything you need to use and maintain your confined space gas detector. Establish safety and compliance in your workplace with this 4 gas confined space monitor from TG Technical Services. 


  • Smallest & lightest 4 gas confined space monitor
    • 2.2″ W x 2.55″ H x 1.02″ D, 3.52 ounces
  • Simultaneous detection of 4 gasesSimple 2-button operation
    • LEL, O2, H2S & CO
    • H2 Compensated CO sensor available
  • Non-Compliance Indicator
  • Alarms: audible, visual, & vibration
  • 3 user adjustable alarm levels
  • 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


The RKI Instruments GX-3R 4 gas confined space kit is renowned for its compact design and comprehensive gas detection, including oxygen, LEL combustibles, carbon monoxide, and hydrogen sulfide. Its lightweight build and long-lasting battery life ensure it won't slow you down during your critical operations.


The non-compliance indicator on this confined space gas monitor serves as an essential safety tool, immediately alerting workers to the potential need for device maintenance. Enhance worksite safety with a trusted RKI Instruments GX-3R 4 gas confined space kit.