UEi Test Instruments AQM4 Air Quality Meter， 1-Pack<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"> Max and min functions included (TWA and STEL for CO2 only) 99 points manual recording 8000 points auto recording </span></li><li><span class="a-list-item"> Large LCD display designed with NDIR waveguide technology CO2 sensor programmable CO level alarm extended drift compensation on CO2 sensor </span></li><li><span class="a-list-item"> Audible alarm (~80db) threshold setting </span></li><li><span class="a-list-item"> Usb cable and software included </span></li><li><span class="a-list-item"> Ac power adaptor included and 4 aa batteries </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31zY76q-0%2BL.jpg" noproxy>