
This is a handy and very delicate item; it measures up to 1/10 degree for temperature and 1% humidity. However, the manufacturer claims that it's calibrated to within 5%, which means that while it's extremely sensitive, it can also be a bit inaccurate. I haven't had a chance to check the calibration. It's easy to set up and is a great way to track temperature and humidity regularly, over time and at specific times and locations. The only problem I had was that the Extech connector didn't work with the SYSTM case on my iPhone; You have to remove the case, which is a bit of a hassle. I can't comment on cases from other manufacturers. Another reviewer mentioned an adapter cable, but I didn't get it from Extech; Maybe they were talking about the cable that came with the Otterbox. Since most people use options, this would be a nice addition. It is tiny and very light, easily fitting in a pocket or small purse.

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