Accurate 2-Channel low drift NDIR CO2 measurement     4.5M External CO2 sensor used in closed space     Display real time CO2 value     Display CO2 chart with adjustable time scale     Auto Max. /Min. Recall     Programmable CO2 zone value & CO2 center value to control output power on/off     Audible alarm that warns CO2 concentration     Target zone indicator     Built-in Day/Night auto detection on CO2 probe to override CO2 control     With Backlight     Powered by AC100~240 VAC directly     Sensing probe cable is 4.5 meter long to extend your measure spot     Installed with 3kA@300VAC fuse in meter to avoid the damage by power overload         Complete Set Includes:     1 x CO2 Meter (Controller + Sensor)     Screws and tapes     English Instruction Manual     Standard factory packaging                Measuring range: 0~5000 ppm     Resolution: 1ppm (0-1000); 5ppm (1000-2000); 10ppm (>2000)          Accuracy:           CO2 below 3000ppm  ±50ppm or ±5% of reading, whichever is greater       CO2 above 3000ppm ±7% of reading          Warm-up time: 30 seconds          Response time CO2:           <2min for 63% of step change or       <4.6min for 90% step change          LCD size: 47 x 104 mm     Meter size: 158 x 106 x 50 mm     Sensor size: 124 x 33 x 26 mm     Operating condition: 0~50°C , 5~95% RH (avoid condensation)     Storage condition: -20~ 60°C, 5~95%RH (avoid condensation)     Power supply: AC100~240VAC     Piggyback socket load 5A@250VAC; 10A@120VAC              7530_US SET IMAGE:           7530_EU SET IMAGE: