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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ThermoPro TP55 Digital Hygrometer Indoor Thermometer Humidity Gauge with Jumbo Touchscreen and Backlight Temperature Humidity Monitor

ThermoPro TP55 Digital Hygrometer Indoor Thermometer Humidity Gauge with Jumbo Touchscreen and Backlight Temperature Humidity Monitor

Product ID: 253162202

Details

Age range (description)
Adult
Brand
TempPro
Colour
White & Grey
Included components
Temperature

💡4" jumbo backlit touchscreen

📏±1°F/°C accuracy

⏱️10-sec rapid response

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Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌡️ Stay ahead of the climate curve with ThermoPro TP55—where precision meets style!

EFFORTLESS VISIBILITY - Large 4-inch touchscreen with backlight ensures crystal-clear readings anytime, even in dimly lit rooms or late-night checks.
PRECISION YOU CAN TRUST - Experience ultra-accurate temperature and humidity readings with ±1°F/°C and ±2-3% RH precision—perfect for your smart home environment.
TRACK EXTREMES LIKE A PRO - Automatically records max and min temperature and humidity, empowering you to fine-tune your thermostat or humidifier settings with confidence.
REAL TIME ENVIRONMENT INSIGHTS - Get instant updates every 10 seconds to monitor your indoor climate and optimize comfort, health, and productivity.
FLEXIBLE PLACEMENT SLEEK DESIGN - Magnetic wall mount or freestanding with modern aesthetics—fits seamlessly into your office, nursery, or living space.

The ThermoPro TP55 is a high-precision indoor digital hygrometer and thermometer featuring a jumbo 4-inch backlit touchscreen for easy reading in any light. It delivers rapid 10-second updates with ±1°F/°C and ±2-3% humidity accuracy, records max/min values, and offers versatile placement options including magnetic wall mounting. Powered by included AAA batteries, it’s designed for professionals and home managers who demand reliable environmental monitoring to enhance comfort, health, and productivity.

Specifications

ASIN	B06XTPTG1J
Additional Features	AAA battery included, Large LCD Screen with Touch Screen and Backlight, Temperature & Humidity Monitor
Age Range Description	Adult
Brand Name	TempPro
Color	White & Grey
Customer Reviews	4.6 4.6 out of 5 stars (23,894)
Display Type	Digital
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	Jumbo Touch Screen and Backlight Temperature Humidity Meter Digital Hygrometer Indoor Thermometer Humidity Meter
Item Weight	2.7 Ounces
Manufacturer	ThermoPro
Model	TP-55
Model Name	FBA_TP-55
Number of Batteries	2 AA batteries required. (included)
Outer Material	Plastic
Part Number	TP-55
Power Source	Battery Powered
Response Time	10 seconds
Reusability	Rechargeable
Smart Home Compatibility	Not Smart Home Compatible
Specification Met	CE, FCC
Style Name	Modern
Unit Count	1 Count
Upper Temperature Range	70 Degrees Celsius
Warranty Description	-.

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