0 ~ 10000ppm 0 ~ 300000ppm + (calibration) Sensitivity sensitivity 0.5% (full scale) Accuracy accuracy +/- 3% (full scale) (under normal temperature and pressure) 0 ~ 10ppm at +/- 1ppm (At normal temperature and pressure) Usage temperature using temperature ℉ 50 ~ 122 (10 ~ 50 'C) Response Time Response time 90% 5 ~ 10s (10 ~ 2000ppm range) 90% 60s (0 ~ 10ppm range) Repeatability Repeatability +/- 1% (at room temperature) Sensor type sensor types B-2C (the United States bought imports) Charging Power Supply Power 220V 50/60Hz 100-115V 50/60Hz (optional)