Has anyone had this long enough to know if the battery will last at least one year?

I've had mine for over a year and it's still going... I've had other battery powered products from a seller and the batteries lasted only a few weeks... It's because the batteries have been installed in that device since the assembly line...If by chance they don't put the little plastic strip between the negative side and the device, the batteries will go bad...

Any way to calibrate temperature?

Calibrate means that you adjust your measuring tool (e.g. thermometer, hygrometer, speedometer, etc.) to give a known value when it's measuring (detecting) that value; you usually do this by adjusting a screw or other mechanism that results in the unit showing a 'reading', or measurement, of that known value on its display or output. This unit does NOT have any calibration adjustment.

What do the low and high represent...is it for the last 24 hours?

As several others have said, it's the HIGH & LOW since it was reset. To reset, HOLD the button marked F/C until it resets. Each time that button is pressed, the displayed temperature changes between Fahrenheit and Celsius.

In China. I bought 3 of them, but don't find them useful. The setting for humid, dry, comfort is inaccurate for a relativity level reading in a home environment. At least in the Midwest region. They say 49% is dry when in fact it's too much for a home to carry, at least in the winter colder temps.

ASIN	B01H1R0K68
Battery Description	Alkaline
Brand Name	ThermoPro
Color	White
Customer Reviews	4.6 out of 5 stars 140,834 Reviews
Global Trade Identification Number	06927082801612
Included Components	Temperature and Humidity Monitor,One AAA battery,User Manual
Item Dimensions W x H	21W x 67H millimeters
Item Length	9.7 Centimeters
Item Type Name	Digital Hygrometer Indoor Thermometer Humidity Monitor with Temperature Humidity Gauge
Item Weight	0.06 Kilograms
Item height	6.7 centimeters
Manufacturer	ThermoPro
Mounting Type	Tabletop, Wall Mount
Operating Humidity	10% ~ 99%
Temperature Accuracy	+/- 0.56°C
Unit Count	1 Count
Upper Temperature Range	158 Degrees Fahrenheit
Voltage	1.5 Volts

ThermoPro TP50 Digital LCD Thermometer Hygrometer Temperature Humidity Meter

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