Seller is fine. Excellent delivery and condition. The manufacturer of this device is part of a pool of fake companies that essentially have the same manufacturing facility making the same device. Our company has bought about 6 of these devices over the last few years and they all ended up failing or failing. Recalibration costs about the same. It's not worth it. Ex-Tech makes these too, they just use different colored plastic, they're all the same cheap devices. Unreliable and will cost you over time. A fair price for these devices would be under $100, but that's not the case. I uploaded two photos from 3 devices. All about a year old, all off and mostly inaccurate. One image is the inner environment, the other the outer environment.
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