RKI Eagle 1 to 6 Gas Portable Gas Detector The RKI Eagle is one of the most versatile portable gas detectors on the market, and features simultaneous readout of up to six gases. The Eagle's standard configuration is LEL, O2, H2S, CO and is capable of utilizes a variety of toxic sensors which can be replace some of the standard sensors. The Eagle features the industry's widest selection of high quality, long life and field proven sensors.