The calibration is mainly used to calibrate coal mine methane sensor, oxygen sensor, carbon monoxide sensors, such as methane power for the use of fixed gas detection instrument; can also be used for ground calibration gases Detection Alarm, analyzer. District is mine ventilation, safety instrumentation metering station (laboratories), and other units the best option. Measuring range: 60-600 ml / min, 0-10-10Mpa Uncertainty: 4%, 2.5% Standard Gas Capacity: 140 L Quality: 5 kg