Product review (5 stars): Easy to read, fast and accurate.
These were purchased to check humidity in a couple of areas we have lots of books stored in. I have a large wall-type unit with temp, pressure, humidity gauges, plus a indoor/outdoor digital unit from LaCross. These units are accurate, matching exactly with my office units when in the same room. So, I know that where I place them, I am getting accurate humidity and temperature readings. And, unlike most temp/humidity units, the humidity is the large number on top, making it easy to read at a glance. The humidity gauge is very fast, stabilizing in just a few seconds when moved from one area to another. If you are using dehumidifiers in any part of your home or business, this is a great addition to help control humidity and monitor the use of the dehumidifiers to control energy costs. For those who are interested, the units also store and display min/max values for both humidity and temperature.

The units were shipped quickly and well packaged. They use a standard AA battery, which should last a long time between changes.