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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TempPro TP50 Digital Hygrometer Indoor Thermometer Room Thermometer | Humidity Meter Humidity Gauge with Temperature Humidity Monitor for House Office Celler Greenhouse RV (Previously ThermoPro)

Product ID: 31915677

Details

Age Range (Description)
Adult
Brand
TempPro
Color
White
Display Type
Digital
Included Components
Temperature
Model Name
TP-50

💧2-3% RH precision

⏱️10-sec refresh rate

🌡️±1°F accuracy

$25.74

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Description

🌿 Stay ahead of your air — because comfort is the new luxury.

VERSATILE MULTI USE - Perfect for home, greenhouse, fridge, humidor, reptile tank, and more—your all-in-one environment monitor.
INSTANT WELLNESS CHECK - Humidity level icons (DRY/COMFORT/WET) keep your environment optimized at a glance.
PRECISION YOU CAN TRUST - High accuracy readings with ±1°F temperature and 2-3% RH humidity ensure reliable data every 10 seconds.
SLEEK PRACTICAL DESIGN - Compact tabletop stand plus magnetic back for flexible placement anywhere in your space.
TRACK TRENDS EFFORTLESSLY - Records high/low temperature and humidity to help you analyze and perfect your indoor climate.

The TempPro TP50 Digital Hygrometer is a top-rated indoor thermometer and humidity monitor offering ±1°F temperature accuracy and 2-3% RH precision. With a quick 10-second refresh rate and intuitive humidity level icons, it empowers you to maintain a healthier, more comfortable environment. Its versatile design fits anywhere—from counters to fridges—making it a must-have for wellness-conscious professionals.

Specifications

ASIN	B01H1R0K68
Additional Features	High accuracy 2~3%RH and ±1°F
Age Range Description	Adult
Best Sellers Rank	#39 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #1 in Weather Hygrometers #1 in Indoor Thermometers
Brand Name	TempPro
Color	White
Customer Reviews	4.6 4.6 out of 5 stars (154,514)
Display Type	Digital
Global Trade Identification Number	06927082801612
Included Components	Temperature and Humidity Monitor,One AAA battery,User Manual
Item Length	2.62 Inches
Item Type Name	Digital Hygrometer Indoor Thermometer Humidity Monitor with Temperature Humidity Gauge
Item Weight	0.06 Kilograms
Manufacturer	TempPro
Model	TempAir CORE TP-50
Model Name	TP-50
Number of Batteries	1 A batteries required. (included)
Part Number	TP50
Power Source	Aaa Battery （included）
Response Time	2 seconds
Smart Home Compatibility	Not Smart Home Compatible
Style Name	Indoor Thermometer & Hygrometer
Unit Count	1.0 Count
Upper Temperature Range	158 Degrees Fahrenheit

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