GfG Instrumentation 1999-345 Sensor Pack for G888 / G999 (LEL, O2 (Lead Free), COSH CO (1 ppm Res., 0 - 500 ppm Range), H2S (0.5 ppm Res., 0 - 100 ppm Range)).
COSH - combination CO (1 ppm resolution, 0 - 500 ppm range) and H2S (0.5 ppm resolution, 0 - 100.0 ppm range) sensors providing discrete readouts for each channel.