RKI Instruments ESR A13i H2S Sensor, Hydrogen Sulfide (H2S) 0 200 ppm for GX 3R GX 3R Pro GasWatch 3 8cal Arcguard Arc Flash Kit 1m) CSA 39 in SWSI22GW 8 1m) CSA 39 in (1m) such as: Balance Mode Adjusts the environmental listening function volume balance between the left and right speaker giving the operator the ability to prioritize audio or adjust to their own personal preference Release Time The release time setting adjusts the time before the limiter opens after activation RKI Instruments ESR A13i H2S $184 Hydrogen Sulfide (H2S) 0 200 ppm for GX 3R GX 3R Pro GasWatch 3 Premier Portable Instruments GX 3R GX 3R Pro GasWatch3 Pro 04 Series Replacement Sensor