These do not display DegF, I took mine apart, there is no actuator or button in the C/F hole. If I would have known there's no F display I wouldn't have bought it. The product must have been revised to save a penny, I seen one guy said his worked. Mine display only DegC. I have three and the DegC spread is .7 degrees between the high one and the low one, .2 deg between the low and medium. The RH spread is 2% and 0%. I just threw them in with a bovida, so I may comment on the range later.
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I used these in my 3 string Guitars as a sort of novelty item, but they do work excellent for a cigar box with stogies so they don't dry out. This was a great purchase for cheap china made junk. lol
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Based on the price, this performed better than expected. Didn't anticipate it having both Fahrenheit and Celsius settings, but it did. I purchased two, and so far they are fairly accurate. Other analog hygrometers claim to be adjustable, but are very erratic and never hold their settings. This can't be calibrated, but right now, it doesn't need it. Time will tell. So far, so good.
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After putting in a battery, press a conductive object inside the hole marked C/F and presto Fahrenheit temp reading!
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Tested accurate against my analog gauges. Nice easy to read display. Super price! I will be getting more.
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