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.

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🌿 Stay ahead of the curve with precision climate control!

PRECISION YOU CAN TRUST - High accuracy readings within ±2-3% RH and ±1°F ensure your environment is always optimized.
TRACK TRENDS LIKE A PRO - Easily monitor high and low temperature and humidity records to fine-tune your home or workspace.
VERSATILE SLEEK DESIGN - Magnetic back and tabletop stand let you place it anywhere—from fridge to greenhouse—with effortless style.
INSTANT AIR COMFORT INSIGHT - Quick-glance humidity icons keep your space in the perfect DRY/COMFORT/WET zone.
REAL TIME ENVIRONMENT UPDATES - Data refreshes every 10 seconds so you never miss a change in temperature or humidity.

The ThermoPro TP50 3-piece digital hygrometer set delivers professional-grade accuracy with ±1°F temperature and ±2-3% humidity precision, updating every 10 seconds. Featuring intuitive air comfort icons and high/low record tracking, it empowers you to maintain an ideal indoor environment for health and comfort. Its versatile magnetic and tabletop design fits seamlessly into any modern home or workspace.

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Brand	ThermoPro
Battery Description	zinc
Mounting Type	Tabletop
Operating Humidity	10% - 99%
Upper Temperature Rating	158 Degrees Fahrenheit
Voltage	1.5 Volts
Temperature Accuracy	±0.56°C
Manufacturer	ThermoPro
Country of Origin	China
Special Feature	High Accuracy
Item Weight	200 g
Package Dimensions	22.61 x 8.2 x 1.9 cm; 200 g
Batteries	3 AAA batteries required. (included)
Item part number	TP-50-3
Power Source	Battery Powered
Battery type	zinc
Are batteries included?	Yes

ThermoPro TP50 3 Pieces Digital Hygrometer Indoor Thermometer Room Thermometer and Humidity Gauge with Temperature Humidity Monitor

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