Product review (2 stars): Handy and useful, but may not work with all smartphone cases without an adapter BUT BROKE WITHIN TWO MONTHS
This is a handy item which is highly sensitive; it measures up to 1/10th of a degree for temperature and 1% of humidity. However, the manufacturer claims that it is calibrated to be within 5% of accurate, which means that while it is extremely sensitive, it could also be mildly imprecise. I had no way of checking the calibration. Set-up is easy and it's a great way to be able to keep track of temp and moisture on a regular basis, over time, and at specific times and locations. The only problem I experienced was that the Extech plug doesn't work with SYSTM case on my iPhone; I have to remove the case, which is somewhat of a hassle. I can't comment about other brands of cases. Another reviewer mentioned an adapter cable, but I didn't receive one with the Extech; maybe they were talking about a cable that came with their Otterbox. Since most people do use cases, that would have been a good addition. It's tiny and extremely lightweight, easily stashed in a pocket or small purse.