Extech RH390-NIST Precision Dual Display Hygro Thermometer Psychrometer with 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"> Fast response time (</span></li><li><span class="a-list-item"> Dual backlit display </span></li><li><span class="a-list-item"> Simultaneous display of: Humidity/Temperature， Humidity/Dew Point or Humidity/Wet Bulb </span></li><li><span class="a-list-item"> Data Hold and Min/Max functions </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31xrsi1NfCL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/5188PYl7WeL.jpg" noproxy>