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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ThermoPro TP50 Digital LCD Thermometer Hygrometer Temperature Humidity Meter

ThermoPro TP50 Digital LCD Thermometer Hygrometer Temperature Humidity Meter

Product ID: 253478331

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Details

Colour
White
Brand
ThermoPro
Product dimensions
21W x 67H
Item weight
2.72 Ounces
Battery description
Alkaline

💧±2-3% RH precision

⏱️10-sec refresh rate

🌡️±1°F accuracy

Description

🌿 Stay ahead of the climate curve with ThermoProTP50 — your home's personal comfort guru!

PRECISION YOU CAN TRUST - High accuracy readings ensure you never miss a humidity or temperature shift.
TRACK TRENDS LIKE A PRO - High/low record tracking empowers smarter home and health decisions.
INSTANT AIR COMFORT INSIGHT - Quick-glance DRY/COMFORT/WET indicator keeps your environment perfectly balanced.
HEALTHIER LIVING SMARTER SPACES - Optimize indoor air for skin, allergies, and even specialty uses like humidors or greenhouses.
VERSATILE PLACEMENT ULTIMATE CONVENIENCE - Tabletop, magnetic, or wall mount—fits seamlessly into any space or lifestyle.

The ThermoProTP50 is a digital LCD thermometer and hygrometer offering ±1°F temperature accuracy and ±2-3% relative humidity precision, updated every 10 seconds. Featuring an intuitive air comfort indicator and high/low record tracking, it supports healthier indoor environments and versatile placement options for any room or specialty use.

Specifications

Color	White
Brand	ThermoPro
Product Dimensions	0.84"W x 2.62"H
Item Weight	2.72 Ounces
Battery Description	AAA
Mounting Type	Tabletop
Upper Temperature Rating	158 Degrees Fahrenheit
Voltage	1.5 Volts
Temperature Accuracy	1 Degrees Fahrenheit
Manufacturer	ThermoPro
Global Trade Identification Number	06927082801612
Part Number	ThermoPro
Item Weight	2.72 ounces
Item model number	Digital thermometer hygrometer TP50
Batteries	1 AAA batteries required. (included)
Is Discontinued By Manufacturer	No
Size	Classic
Material	Plastic
Shape	Rectangular
Power Source	Aaa Battery （included）
Item Package Quantity	1
Number Of Pieces	1
Measurement Accuracy	1
Display Style	Digital
Special Features	High accuracy 2~3%RH and ±1°F
Included Components	Temperature and Humidity Monitor,One AAA battery,User Manual
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Zinc Carbon
Description Pile	AAA

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