Extech SD800 CO2， Humidity and Temperature Datalogger<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> Records data on an SD card in Excel format </span></li><li><span class="a-list-item"> Checks for Carbon Dioxide (CO2) concentrations </span></li><li><span class="a-list-item"> Maintenance free dual wavelength NDIR (non-dispersive infrared) CO2 sensor </span></li><li><span class="a-list-item"> Triple LCD simultaneously displays CO2， temperature and relative humidity </span></li><li><span class="a-list-item"> Measurement ranges: CO2-0 to 4，000ppm; temperature-32 to 122-Degrees F (0 to 50-Degrees C); humidity-10 to 90-percent RH </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41vucQ5IbEL.jpg" noproxy>