Extech RH490-NIST Precision Hygro-Thermometer with Grains Per Pound (GPP) Display 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"> Less then 30 seconds of RH response time </span></li><li><span class="a-list-item"> Water vapor in GPP </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"> Slim design with rubberized side grips </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31xJE8YjTfL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/5188PYl7WeL.jpg" noproxy>