Product review (5 stars): Easy to use and understand
<div id="video-block-R3AWGNOHN1TZT8" class="a-section a-spacing-small a-spacing-top-mini video-block"></div><input type="hidden" name="" value="https://images-na.ssl-images-amazon.com/images/I/A1ZXUIpNv3S.mp4" class="video-url"><input type="hidden" name="" value="https://images-na.ssl-images-amazon.com/images/I/71FsCZzEJMS.png" class="video-slate-img-url">This is an easy-to-use temperature meter for an extremely wide range of temperatures and relative humidity for use outdoors, in buildings, vehicles, aviation (up to 2,000 meters altitude) and inside ductwork.  A high-capacity hygrometer sensor is at the end of the shaft to allow reaching into ductwork.

The buttons are clearly labeled and intuitive when holding the 6.4 ounce (180 g) meter.  Just press the on button and get temperature and relative humidity.  Response looks near-instant as shown in this brief video, however the unit needs to spend 180 seconds in an environment to give an accurate humidity reading.  Display is large - easy to read.  It needs to spend 10 seconds in an environment to give a guaranteed accurate temperature reading.

The unit automatically turns off when not used.  After 30 minutes, it shuts off if no button is pressed.

The current/present reading can be held on the display by pressing HOLD, and then released by pressing HOLD again.  This allows one to reach into ductwork and hold the reading, for example.

Press the MIN MAX button to tell the unit to store in its memory all the minimum and maximum values on the display.  Exit MIN MAX mode by pressing and holding that button for 2 seconds.

When the battery is low, a battery symbol appears on the display.

This product comes with a one-year warranty and Amprobe dealers are authorized to replace a unit on the spot.  Amprobe is located in the U.S., Canada and Germany.  I like this meter.  It's more accurate than temperature gauges in my home.