Extech RH350-NIST Psychrometer with 2 Type K Remote Temperature Probes and NIST<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"> Superheat differential measurements: T1-T2， Air-T1， T1-Dewpoint </span></li><li><span class="a-list-item"> Dual Type K external temperature probe input </span></li><li><span class="a-list-item"> Simultaneous display of %RH， Temperature and Dew point or Wet Bulb or External Probe Temperatures </span></li><li><span class="a-list-item"> Built-in RS-232 interface (optional RS-232 cable) - uses Windows HyperTerminal to download data to a PC </span></li><li><span class="a-list-item"> Memory stores up to 99 data records </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31c2HQRBAgL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/5188PYl7WeL.jpg" noproxy>