Update: I have contacted Extech about the defective unit, they will send me a new one without question. I've already started buying another one as I've always wanted a backup device for my home visits. The second unit is working great and I should get a replacement from Extech next week. So I'm changing my rating to 5 stars as I think the block is great for home viewing. Worked well initially, very sensitive. I like the large display as I am a home inspector and need to take photos of readings for my reports. But the display started behaving, sometimes it worked and sometimes it didn't. Or I would turn it on and calibrate it and it would read high humidity when it wasn't near anything. I'm sending it back to Extech. I'll let you know what happens when I can add to this review later.
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