... % F.S. Alarm method: light, sound and vibration Features1. Test gas in the office, workshop, train, bus, mine, mountain, vessel cabinet ect ... . 5. Sensor changeable6. Automatic Temperature Compensation in full range. 7. Large test range up to 0-50000ppm or 0-100% Vol. 8 ... -100ppm0-2000ppmResolution0.001ppm0.01ppm0.1ppmResponse Time: 30S max40S maxOthers available gas: All