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 TP55 Digital Indoor Hygrometer Thermometer, 4-Inch Temperature/Humidity Monitor with Touchscreen and Backlit, Room Thermometer/Humidity Meter for House Home Greenhouse (Previously ThermoPro)

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

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Description

🌡️ Elevate your space with precision comfort monitoring — because your environment deserves the best.

PRECISION YOU CAN TRUST - Advanced sensors deliver ultra-accurate temperature and humidity data to optimize your environment.
DATA DRIVEN COMFORT CONTROL - Max/min records and intuitive comfort icons empower proactive environment management.
INSTANT CLARITY ZERO GUESSWORK - Large backlit touchscreen ensures effortless, quick readings even in low light.
STAY AHEAD WITH REAL TIME UPDATES - Refreshes every 10 seconds so you never miss a critical change in your space.
FLEXIBLE PLACEMENT READY OUT OF THE BOX - Use tabletop, wall mount, or magnetic attach with included batteries for seamless setup.

The TempPro TP55 is a sleek, 4-inch digital indoor hygrometer and thermometer featuring a touchscreen with backlit display for easy reading. It offers highly accurate temperature (±1°F) and humidity (±2% RH) measurements, refreshing every 10 seconds to provide real-time data. Designed for versatile placement—tabletop, wall, or magnetic mount—and includes max/min records plus comfort indicators to help you maintain optimal indoor conditions effortlessly. Batteries 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	#2,029 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #17 in Indoor Thermometers
Brand Name	TempPro
Color	White & Grey
Customer Reviews	4.6 4.6 out of 5 stars (27,430)
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	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	Reusable
Smart Home Compatibility	Not Smart Home Compatible
Specification Met	CE, FCC
Unit Count	1.0 Count
Upper Temperature Range	158 Degrees Fahrenheit

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¥5324

Duties & taxes included

In stock

Sold byAmazon JapanDelivered 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 Japan.

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