... % F.S. Alarm method: light, sound and vibration Features1. Test gas in the office, workshop, train, bus, mine, mountain, vessel cabinet ... battery. 4. High accuracy, high resolution and easy operation. 5. Sensor changeable6. Automatic Temperature Compensation in full range. 7. Large test ... -100ppm0-2000ppmResolution0.001ppm0.01ppm0.1ppmResponse Time: 30S max40S maxOthers available gas: All