Measurement range/scale range: 300-5000ppm Number of suctions: 1 time (standard) Conversion factor: 1 Measurement time: 1 minute Detection limit: 30ppm (1 time) Discoloration: Light blue → purple Temperature and humidity correction: None Expiration date: 3 years from production Subject gas: Carbon二氧化碳 适用气体:二氧化碳 到期期(年):3 测量范围(PPM):300-5000