This instrument is a portable gas analyser adopt high precision MPU as the core part. The instrument uses digital display, and is straightforward, precise, stable, and quick in response. It is equipped with a rechargable battery, and can work directly or on an external power supply. Main functions and specifications: 1 Temperature range: 10 35 Humidity range: ≤90%RH 2 Power supply: 220V±10%/10W/50Hz 3 Dimension: 310×260×145mm 4 Weight: 5.6kg 5 Calibration method: Aotomaticly 6 Lifespan of the sensor: 2 years (or 5) 7 Equipped with standard RS-232C data interface. It is widely used in CA store rooms for keeping fruits and vegetables in agriculture