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

Product ID: 31915677

Details

Battery Description
AAA
Brand
TempPro
Color
White
Item Weight
0.06 kg
Product Dimensions
0.84"W x

💧±2-3% RH precision

⏱️10s refresh rate

🌡️±1°F accuracy

81.28 DT

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Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌿 Stay ahead of the curve with TempPro TP50 — your personal indoor climate guru!

REAL TIME UPDATES - Data refreshes every 10 seconds so you never miss a change in your indoor climate.
INSTANT WELLNESS CHECK - Humidity level icons (DRY/COMFORT/WET) keep your space perfectly balanced at a glance.
PRECISION YOU CAN TRUST - High accuracy readings with ±1°F and ±2-3% RH ensure your environment is always optimized.
TRACK TRENDS LIKE A PRO - High/low temperature and humidity records help you analyze and improve your home’s air quality over time.
VERSATILE SLEEK DESIGN - Magnetic back and tabletop stand let you place it anywhere—from fridge to greenhouse—with style and ease.

The TempPro TP50 Digital Hygrometer Indoor Thermometer delivers precise temperature and humidity monitoring with ±1°F and ±2-3% RH accuracy. Featuring a quick 10-second refresh rate and intuitive humidity level icons, it empowers you to maintain optimal indoor air quality effortlessly. Its versatile design includes a magnetic back and tabletop stand, making it perfect for any room, from kitchens to greenhouses. Trusted by over 150,000 users, it’s the #1 choice for indoor climate control.

Specifications

Asin	B01H1R0K68
Battery Description	AAA
Best Sellers Rank	#20 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 (156,017) 4.6 out of 5 stars
Global Trade Identification Number	06927082801612
Included Components	Temperature and Humidity Monitor,One AAA battery,User Manual
Item Dimensions W X H	0.84"W x 2.62"H
Item Highlight	Humidity Meter Humidity Gauge with Temperature Humidity Monitor for House Office Celler Kitchen Greenhouse RV
Item Length	2.62 inches
Item Type Name	Digital Hygrometer Indoor Thermometer Humidity Monitor with Temperature Humidity Gauge
Item Weight	0.06 kg
Manufacturer	TempPro
Model	Digital thermometer hygrometer TP50
Mounting Type	Tabletop
Number Of Items	1
Part Number	TP50
Temperature Accuracy	1 °F
Unit Count	1 Count
Upper Temperature Range	158 °F
Voltage	1.5 volts

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