Description :<br>CEM DT-802 0-9999ppm Multifunction Air Quality CO2 Monitor Meter Tester<br>Features : <br>Checks for Carbon Dioxide ( CO2 ) concentrations with Max \/ Min value recall function !<br>Maintenance free NDIR (non-dispersive infrared) CO2 sensorIndoor Air Quality displayed in ppm with : Good (380 to 420ppm)， Normal (&amp;lt;1000ppm)， Poor (&amp;gt;1000ppm) indication.<br>Visible and Audible CO2 warning alarmIt also displays Year， Month， Date， and Time.Automatic Baseline Calibration (minimum CO2 level over 7.5 days) or manual calibration in fresh air.<br>Specification : <br>Brand Name : CEMModel Number : DT-802Color : White<br>          Fuction       Range       Resolution       Accuracy           CO2       0-9999ppm       1ppm       &amp;plusmn;78ppm(0-2000ppm) \/ &amp;plusmn;8%(2000-9999ppm)           Temperature       -10 to 60 C\/    14 to 140  F       0.1 C\/  F       &amp;plusmn;1 C \/ 1.8  F           Humidity       0.1 to 99.9% RH       0.1% RH       &amp;plusmn;3% RH(25 C \/ 30 to 99%RH)    &amp;plusmn;4% RH(25 C \/ 0 to 30%RH)   <br>Package includes : <br>1 x CEM DT-802 CO2 Monitor Meter1 x Power supply1 x English use manual<br>Details pictures :