![Four Gas Monitor, confined space detector features simultaneous detection of LEL, O2, H2S & CO. World's smallest and lightest portable multigas Detector. RKI's high quality safety instrument. Four Gas Monitor, confined space detector features simultaneous detection of LEL, O2, H2S & CO. World's smallest and lightest portable multigas Detector. RKI's high quality safety instrument.](http://www.rkiinstruments.com/app/uploads/2018/10/GX-3R.jpg)
Four Gas Monitor, confined space detector features simultaneous detection of LEL, O2, H2S & CO. World's smallest and lightest portable multigas Detector. RKI's high quality safety instrument.
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Gas Detector, ACEGMET 4 Gas Monitor Multiple Indicator (Vibration, Audible, Visual) H2S, O2, CO and LEL 4 Gas Monitor Personal Rechargeable 4 Gas Meter 2 Years of Sensor Life Gas Sniffer - Amazon.com
![flammable limit || UEL & LEL || Example of some gases || Graph || gas detector use to measure LEL - YouTube flammable limit || UEL & LEL || Example of some gases || Graph || gas detector use to measure LEL - YouTube](https://i.ytimg.com/vi/o8b8tjzd6Vw/hqdefault.jpg)