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 TempAir Digital Hygrometer Indoor Thermometer Room Thermometer | Humidity Meter Humidity Gauge with Temperature Humidity Monitor for House Office Celler Kitchen Greenhouse RV, 2 Pack

Product ID: 138292020

Details

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

💧±2-3% RH precision

⏱️10-sec refresh rate

🌡️±1°F accuracy

฿2590

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Sold byAmazon ThailandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌿 Stay ahead of the air—because your space deserves smart care.

REAL TIME UPDATES - Data refreshes every 10 seconds so you’re always ahead of humidity and temperature shifts.
VERSATILE PLACEMENT - Magnetic back and tabletop stand let you position it anywhere—from fridge to greenhouse.
INSTANT WELLNESS CHECK - Humidity icon shows DRY/COMFORT/WET at a glance—never miss a beat on your indoor air quality.
PRECISION YOU CAN TRUST - High accuracy readings with ±1°F and ±2-3% RH keep your environment perfectly monitored.
HEALTH PRESERVATION ALLY - Optimize skin health, protect collectibles, cigars, and even reptiles with precise humidity control.

The TempPro TempAir Digital Hygrometer is a compact, highly accurate indoor thermometer and humidity monitor with ±1°F temperature accuracy and ±2-3% relative humidity precision. Featuring a quick 10-second refresh rate and a wellness indicator icon, it provides real-time insights into your environment’s comfort level. Designed for versatile use with a magnetic back and tabletop stand, it’s perfect for homes, offices, greenhouses, and specialty storage like humidors or reptile tanks. Includes 2 AAA batteries and supports °F/°C selection.

Specifications

ASIN	B07R3YC1BC
Battery Description	Alkaline
Best Sellers Rank	#35 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 (155,223)
Included Components	Temperature and Humidity Monitor,AAA battery,User Manual
Item Dimensions W x H	2.6"W x 3.1"H
Item Length	2.62 inches
Item Weight	2.72 ounces
Manufacturer	TempPro
Model	TempAir CORE TP-50-2
Mounting Type	Tabletop
Number of Items	2
Operating Humidity	10% ~ 99%
Part Number	TP50-2
Temperature Accuracy	±1 °F
Temperature Reading Accuracy	plus_minus_1_degree_fahrenheit
Unit Count	2 Count
Upper Temperature Range	158 °F
Voltage	3 volts

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