Can the hygrometer be calibrated?

Use the salt test in a plastic bag. You can google for details. Just add a bit of water to make teaspoon of salt all wet. I don't know if there's a way to adjust the sensor reading, I found mine within 3%

There are 2 minimum indoor temperatures listed 14 and 32 degrees F. Which is correct?

You must have interpreted the readings incorrectly. Did you press min and see 14, then reset and see 32, then press min again and see 32? If you press reset the min and max are set to the current temp. In that case 14 would be the correct min.

How do you mount this to the wall?

There is a hole, and you can mount it to the wall, and would you please see this back of picture for this item: https://images-na.ssl-images-amazon.com/images/I/61JkeYhU-mL._SL1024_.jpg But there is no screw was included, thanks.

ASIN	B00DXY960A
Battery Description	One battery (not included)
Battery description	One battery (not included)
Best Sellers Rank	417,917 in Garden ( See Top 100 in Garden )
Brand	iKKEGOL
Colour	White
Customer Reviews	4.4 out of 5 stars 845 Reviews
Item Dimensions W x H	7W x 12.4H centimetres
Item Length	12.4 Centimetres
Manufacturer	iKKEGOL
Mounting Type	Wall Mount
Mounting type	Wall Mount
Product dimensions	7W x 12.4H centimetres
Temperature Accuracy	0.1
UPC	700358011146
Unit Count	1.0 count
Upper Temperature Rating	158 Degrees Fahrenheit
Upper temperature rating	158 Degrees Fahrenheit

iKKEGOL Dual Sensor LCD Display Indoor Outdoor Digital Thermometer Hygrometer with Max Min Memory

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