Measurement range: 20 to 300 ppm Airflow speed and flow rate: 50 ml/min Measurement time: 10 minutes Comment: 1 Discoloration: Light red → light blue Temperature and humidity correction: Temperature Expiration date: Up to 2 years Subject gas: Methanol Subject gas: Methanol (continuous suction类型) 执行期(年):2 测量范围(PPM):20至300