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Contact SupplierDisplay method: TFT LCD screen display, 480X270 pixels • Detection method for PM: Laser Scattering • Concentration unit for PM: ug/m³ • Concentration unit for HCHO and TVOC: mg/m³ • Power source: Lithium battery with 3000 mAh capacity • Charging : 5V DC power charging via micro USB port • Product weight: 235g • Detection data range: PM2.5(0-1000) • HCHO(0.001-1.999Mg/M3) • TVOC(0.001-9.999Mg/M3) • CO2( 0-5000 ppm)