Product review (5 stars): More expensive then some but well worth it
This is my review having bought this item from Amazon England..and I bought this after much research and I'm sure I have made the right choice. I suffer badly with COPD and I need a more accurate reading of the air quality in my home so I can set my other equipment to fine tune the air for better breathing ....Firstly...It is very accurate and you also have the ability to calibrate it with the appropriate Kit but it is around $30/40..,but remember...DO NOT mess with these adjustment screws unless. A) you know what your doing and B) you own the calibration kit,,They are not there to tamper with otherwise,  and even when using the screws ,only very small adjustments have to be made each time allowing 30 mins between each adjustment...if temp and Dew point is essential then look no further..It also comes with an 18" probe which sits on the side in it's own little holder...this is great for those hard to get to places that need to check if damp has set in.

It's real easy to set up and it's quick to respond to the atmosphere around it which is handy as you don't always want to leave it hours on end for results...It's also very well made with a small kick stand at the rear to place on any flat surface..You also have the ability to set a high and low humidity (maybe more for those monitoring technical equipment) and also a reset button to see what changes have occured during the day.

I will point out that it IS Green with a silver accent and not black as the main photo shows,but it looks quite smart none the less...40 gets you a great accurate Temp gauge and Dew point monitor and it does a fantastic job. Highly recommended.

P.S..it actually takes 2xAAA batteries although the way it's worded sounds like it only takes 1.