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 2 Pieces Digital Hygrometer Indoor Thermometer Room Thermometer and Humidity Gauge with Temperature Humidity Monitor

ThermoPro TP50 2 Pieces Digital Hygrometer Indoor Thermometer Room Thermometer and Humidity Gauge with Temperature Humidity Monitor

Product ID: 138292020

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Details

Color
White
Brand
ThermoPro
Product Dimensions
2.6"W x 3.1"H
Item Weight
2.72 Ounces
Battery Description
Alkaline

💧±2-3% RH precision

⏱️10-sec refresh rate

🌡️±1°F accuracy

Description

🌿 Stay ahead of the curve with ThermoPro TP50 — your personal climate command center!

PRECISION YOU CAN TRUST - High accuracy readings ensure your environment is always optimized to the degree and percent.
TRACK TRENDS LIKE A PRO - High/low records let you analyze your home’s climate patterns for smarter adjustments.
VERSATILE PLACEMENT USE - Magnetic back and tabletop stand fit seamlessly anywhere—from fridge to greenhouse to humidor.
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 is a dual-pack digital thermometer and hygrometer delivering ±1°F temperature accuracy and ±2-3% humidity precision with a rapid 10-second refresh rate. Featuring an intuitive air comfort indicator, high/low record tracking, and versatile mounting options, it’s designed to optimize indoor environments for health, comfort, and specialized uses like greenhouses or humidors.

Specifications

Color	White
Brand	ThermoPro
Product Dimensions	2.6"W x 3.1"H
Item Weight	2.72 Ounces
Battery Description	Alkaline
Mounting Type	Tabletop
Upper Temperature Rating	158 Degrees Fahrenheit
Voltage	3 Volts
Temperature Accuracy	±1 Degrees Fahrenheit
Temperature Reading Accuracy	plus_minus_1_degree_fahrenheit
Manufacturer	ThermoPro
Part Number	1
Item Weight	2.72 ounces
Item model number	Digital thermometer hygrometer TP50-2
Batteries	2 AAA batteries required. (included)
Size	Classic
Material	Plastic
Power Source	Aaa Battery (Included)
Item Package Quantity	2
Measurement Accuracy	1
Display Style	Digital
Special Features	High accuracy 2~3%RH and ±1°F
Included Components	2 PACK Temperature and Humidity Monitor,One AAA battery,User Manual
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Other Than Listed
Description Pile	Alkaline

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