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Product Specifications Display method: 4.3” LCD screen display, 480X270 pixels Atmospheric pressure: 86Kpa - 106Kpa Detection method for CO2: Infrared ( NDIR ) Detection method for PM: Laser Scattering Sampling time: 1.5 seconds Product Size: 145 x 78 x 97.2mm Detection temperature: -10°C to 50°C; Relative humidity: 20% - 85% Storage temperature: -10°C to 60°C; Concentration unit for CO2: PPM Concentration unit for PM: ug/m3 Concentration unit for HCHO and TVOC: mg/m3 Power source: Lithium battery with 3000 mAh capacity; 5V DC power charging via micro USB port Product weight: 235g