Product review (5 stars): This thing is great
I usually use a set of "identical" wireless thermometers when balancing A/C flow and temperature levels in a home. Since high quality thermometers are expensive, I use cheaper units for long term readings that are pretty good, but not great, but need to check the errors between them by placing them all in the same small area. That's great, but it doesn't help much with humidity levels too much since the cheap wireless units seem to be non-linear when reading humidity levels. So it's really necessary to have at least one really accurate reading unit to sanity check all of the others against.

I like the Amprobe THWD-3 because it's extremely easy to use, isn't affected by hand holding and lets me move quickly from room to room so I can monitor changes. The user manual isn't really necessary since it's extremely intuitive, but it appears to cover everything quite well. The carrying case is nice, but when wearing it on your belt the probe is hard to insert unless you remove the manual stored inside (extremely minor nit).

It's built like a tank and should stand up to years of use quite well. I'm very happy with how quickly it registers even the slightest temperature changes in a matter of seconds. Cheaper units takes minutes to stabilize and usually can't be trusted for short term changes.

Now, I can get a fast, accurate reading to check temperatures coming out of vents and just use the cheap wireless ones to look at long term readings. Most of the cheaper units are affected by just holding them in your hand and react so slowly that they're largely useless for fast readings.

Bottom line: I'm extremely impressed. I wish I found the Amprobe THWD-3 much sooner.