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

Product ID: 253478331

Details

Battery description
Alkaline
Brand
TempPro
Colour
White
Item weight
0.06 Kilograms
Product dimensions
21W x 67H

💧1% RH humidity accuracy

🔋1 AAA battery, wireless

🌡️0.1°C precision temp

KSh6514

Duties & taxes included

In stock

Sold byAmazon KenyaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌿 Master your indoor climate like a pro—comfort and control in the palm of your hand!

MEMORY MODE - Automatically logs min/max temperature and humidity so you never miss critical changes.
SLEEK WIRELESS - Compact, battery-powered design fits discreetly in any space—no cords, no clutter.
FLEXIBLE PLACEMENT - Magnet and fold-out stand let you position it anywhere—from fridge to shelf—with zero hassle.
INSTANT COMFORT CHECK - Three intuitive icons (dry, comfort, wet) give you a quick climate status at a glance.
PINPOINT CLIMATE CONTROL - Ultra-precise 0.1°C and 1% humidity readings keep your environment perfectly balanced.

The ThermoPro TP50 Digital LCD Thermometer Hygrometer delivers highly accurate temperature and humidity monitoring with 0.1°C and 1% RH precision. Featuring a large, clear LCD with min/max memory, comfort level icons, and a versatile design with magnet and stand, it’s perfect for maintaining optimal indoor environments in homes, offices, greenhouses, and more. Wireless and battery-powered, it updates readings every 10 seconds for near real-time climate tracking.

Specifications

ASIN	B01H1R0K68
Battery Description	Alkaline
Brand Name	TempPro
Color	White
Customer Reviews	4.6 4.6 out of 5 stars (139,746)
Global Trade Identification Number	06927082801612
Included Components	1 Thermometer, 1 AAA Battery, 1 User Manual
Item Dimensions W x H	21W x 67H millimeters
Item Length	9.7 Centimeters
Item Type Name	Digital Hygrometer Indoor Thermometer Humidity Monitor with Temperature Humidity Gauge
Item Weight	0.06 Kilograms
Manufacturer	ThermoPro
Model	Digital thermometer hygrometer TP50
Mounting Type	Tabletop, Wall Mount
Number of Items	1
Operating Humidity	10% ~ 99%
Part Number	TP50
Temperature Accuracy	+/- 0.56°C
Temperature Reading Accuracy	plus_minus_0_point_5_degrees_celsius
Unit Count	1 Count
Upper Temperature Range	158 Degrees Fahrenheit
Voltage	1.5 Volts

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