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 2 Pieces Digital Hygrometer Indoor Thermometer Room Thermometer and Humidity Gauge with Temperature Humidity Monitor(Previously ThermoPro)

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

35277CFA

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Description

🌿 Master your microclimate, master your day.

HEALTH COMFORT FIRST - Optimize your indoor air for skin, allergies, and overall wellness—because your environment should work for you, not against you.
PRECISION YOU CAN TRUST - Get ultra-accurate temperature and humidity readings with ±1°F and ±2-3% RH—no more guessing your indoor climate.
TRACK TRENDS LIKE A PRO - High/low records let you monitor fluctuations over time, empowering smarter decisions for your home or workspace.
VERSATILE PLACEMENT OPTIONS - Magnetic back and tabletop stand mean you can effortlessly position your monitor anywhere—from fridge to office desk.
REAL TIME ENVIRONMENT UPDATES - Stay ahead of changing conditions with data refreshed every 10 seconds—perfect for health-conscious and plant-savvy pros.

The TempPro TP50 2-Pack Digital Hygrometer and Thermometer delivers professional-grade accuracy with ±1°F temperature and ±2-3% humidity precision, updating every 10 seconds. Designed for versatile use with magnetic and tabletop mounting, it tracks high/low records to help you maintain optimal indoor air quality for health, comfort, and specialized environments like greenhouses or humidors.

Specifications

ASIN	B07R3YC1BC
Battery Description	Alkaline
Best Sellers Rank	#36 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #1 in Weather Hygrometers #1 in Indoor Thermometers
Brand	TempPro
Brand Name	TempPro
Color	White
Customer Reviews	4.6 out of 5 stars 154,356 Reviews
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	Digital thermometer hygrometer TP50-2
Mounting Type	Tabletop
Operating Humidity	10% ~ 99%
Part Number	TP50-2
Product Dimensions	2.6"W x 3.1"H
Smart Home Compatibility	Not Smart Home Compatible
Temperature Accuracy	±1 Degrees Fahrenheit
Temperature Reading Accuracy	plus_minus_1_degree_fahrenheit
Unit Count	2.0 Count
Upper Temperature Range	158 Degrees Fahrenheit
Voltage	3 Volts

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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35277CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Senegal.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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The product quality is outstanding. Exactly what I needed for my work.

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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