Product review (5 stars): Finally an accuraty humidty tester.
I'm a musician with a fairly decent guitar collection. It is critical to keep humidity in my music room between 45-50% at all times. Over the years I've bought a variety of cheaper (although not necessarily inexpensive) humidity meters to try and maintain that range of moisture in the room. For the first time, since getting an Amprobe THWD-3 I actually have some level of confidence that I'm actually doing the job. this thing is quick and accurate. It disturbs me that several of the other meters read a full 10% lower than this one does. I have probably been over-humidifying the room because of the inaccuracy of cheaper models. This device wasn't designed to monitor a music room, but it sure does the job. In my last career  I was a heating contractor and I would have love a tool like this to help monitor temperature and humidity professionally. Like all Amprobe tools, this is very solidly built and professional in it's design.