Product review (3 stars): Started out good
I ordered two, and they started out in pretty close agreement -- within a couple percent (although I have no way to know if they were accurate in an absolute sense). Over a few months of use, though, one and/or the other drifted, and now the two of them differ by about 10 percent. Hey, at least they're not very expensive. Still, they give me a rough idea how well my dessicant is working to keep my 3D printer filament dry. I guess I should buy a third, and hope that it agrees with one of the other two, right?  ;-)