I didn't see calibration mentioned in the instructions and there's no calibrate button, is the humidity sensor fairly accurate?

Cannot be calibrated. I bought this and 2 cheaper adjustable AcuRite units. In addition, I have an older ThermoPro indoor/outdoor and two Honeywell smart thermostats that are supposed to be able to control a Honeywell dehumidifier. Six readings ranging from 38% on the indoor/outdoor for it's indoor reading; THIS ThermoPro and one of the AcuRites at 43%, the other AcuRite at 42%, and the Honeywell thermostats at 44% and 45% (although they're on different floors--the 44% was nearer my three new units). So, six opinions from 38% to 44% (ignoring the Honeywell on the other floor), with two at 43%.

Does the backlight stay on constantly or does it shut off and u can turn it on if you need?

When you press the lightbulb icon it activates the backlight and will automatically shut off in around 15 seconds giving a time to view the display, or if you press the lightbulb icon again before the 15 seconds it will shut off when you press it. There is no way to keep the backlight on or extend it beyond 15 seconds except to press the backlight icon after it shuts off, and cannot press it again to extend time before that or it will turn off.

How long do the batteries last under normal usage?

I purchased this on January 26th, 2019 so Ive had it a year and 2 months and the battery gauge reads on the lower end but it still works!

Will sitting this on a window ledge above the kitchen sink result in inaccurate readings?

Sitting on a window ledge above the kitchen sink will not give you accurate readings for the ROOM. The window will affect temperature readings and if you are running hot water in the sink, the humidity readings will probably go up.

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TempPro TempAir Digital Indoor Hygrometer Thermometer with Touchscreen | 4-Inch Temperature/Humidity Monitor with Backlit, Room Thermometer/Humidity Meter for House Home Greenhouse

Product ID: 42087570

Details

Age Range (Description)
Adult
Brand
TempPro
Color
White & Grey
Display Type
LCD
Included Components
Temperature
Outer Material
Plastic

🎯±1°F & ±2% RH precision sensors

📏4-inch jumbo touchscreen display

⏱️10-second real-time refresh rate

AR$69552

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Sold byAmazon ArgentinaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌡️ Elevate your environment with precision and style—because comfort is the new luxury.

PRECISION YOU CAN TRUST - Advanced sensors deliver ultra-accurate temperature and humidity data to optimize your living or growing environment.
DATA DRIVEN COMFORT CONTROL - Max/min records and intuitive comfort icons empower you to maintain the ideal atmosphere for health and productivity.
INSTANT CLARITY ZERO GUESSWORK - Bold 4-inch backlit touchscreen ensures effortless, quick readings at a glance—no squinting required.
FLEXIBLE PLACEMENT READY TO USE - Wall mount, tabletop, or magnetic attach—plus batteries included for instant setup and seamless integration into your space.
STAY AHEAD WITH REAL TIME UPDATES - Refreshes every 10 seconds so you never miss a shift in comfort or conditions—perfect for proactive home or greenhouse care.

The TempPro TempAir Digital Indoor Hygrometer Thermometer features a large 4-inch touchscreen display with backlight for easy reading, highly accurate temperature and humidity sensors with ±1°F and ±2% RH precision, and a fast 10-second refresh rate. Designed for versatile placement and user convenience, it includes max/min records and comfort indicators to help you maintain optimal indoor conditions for your home, office, or greenhouse. Batteries are included for immediate use.

Specifications

ASIN	B06XTPTG1J
Additional Features	AAA battery Included, Large LCD Display with Touchscreen and Backlight, Temperature and Humidity Monitor
Age Range Description	Adult
Best Sellers Rank	#2,372 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #21 in Indoor Thermometers
Brand Name	TempPro
Color	White & Grey
Customer Reviews	4.6 4.6 out of 5 stars (27,481)
Display Type	LCD
Global Trade Identification Number	06927082802183, 08904296700557
Included Components	Temperature and Humidity Monitor, AAA battery Included
Indoor Outdoor Usage	Indoor
Item Length	4.3 inches
Item Type Name	Digital Hygrometer Indoor Thermometer Humidity Gauge with Jumbo Touchscreen and Backlight Temperature Humidity Monitor
Item Weight	2.7 ounces
Manufacturer	TempPro
Model	TempAir CORE TP55
Model Name	FBA_TP-55
Number of Batteries	2 AA batteries required. (included)
Outer Material	Plastic
Part Number	TP-55
Power Source	Aaa Battery (Included)
Response Time	10 seconds
Reusability	Reusable
Specification Met	CE, FCC
Unit Count	1 Count
Upper Temperature Range	158 °F

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