How do you change from f to c or back? they work good but one somehow switched to show c and i can't figure out how to change it back. thanks!

I can't see any button to change

How do you turn them off?

You don’t , they just stay on. Maybe take batteries out if needed.

Is there a way to calibrate this hygrometer?

NO-YES google calibrate hygrometer, using table salt you will be able to establish how much your unit is off-if any. That should allow you to calculate the correct humidity from your reading. You may want to try it several times, to test its repeatability.

One arrived with the battery door completely off. How to reinsert without breaking off the tiny tabs that are supposed to hold it in?

It doesn't look like there is a way.

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🌿 Stay ahead of the climate curve—monitor like a pro, everywhere you go!

PLUG PLAY SETUP - Compact design with embedded opening and included double-sided tape means effortless installation anywhere.
VERSATILE 4 PACK VALUE - Four reliable units perfect for humidors, greenhouses, reptile terrariums, and incubators—cover all your bases in style.
PRECISION YOU CAN TRUST - High-accuracy digital readings with ±1℉ temperature and ±2% humidity precision keep your environment perfectly monitored.
DUAL FUNCTION POWERHOUSE - 2-in-1 thermometer and hygrometer combo saves space and delivers comprehensive indoor climate data instantly.
LONG LASTING PERFORMANCE - Equipped with LR44 batteries that last up to 8 months, plus spares included—stay worry-free and uninterrupted.

The DWEPTU Digital Hygrometer Thermometer 4-Pack offers precise indoor temperature and humidity monitoring with ±1℉ and ±2% accuracy. Featuring a compact 2-in-1 design, easy installation options, and long-lasting LR44 batteries (up to 8 months), this set is ideal for maintaining optimal conditions in humidors, greenhouses, terrariums, and incubators. Backed by a 3-year warranty and professional quality assurance, it’s the smart choice for millennial managers who demand reliability and style.

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Brand	DWEPTU
Special Feature	High Accuracy
Colour	Black
Age Range (Description)	Adult
Included Components	Battery
Outer Material	Plastic
Specification Met	FCC
Display Type	Digital
Product Care Instructions	Wipe Clean
Power Source	Battery Powered
Model Name	Thermometer Hygrometer
Number of Batteries	2 LR44 batteries required. (included)
Item Length	1.89 Inches
Upper Temperature Rating	230 Degrees Fahrenheit
Response Time	3 Seconds
Reusability	Rechargeable
Style	Square
Indoor/Outdoor Usage	Indoor
UPC	192817325688
Manufacturer	Generic Brands
Country of Origin	USA
Item model number	SR-001
ASIN	B08M3P74N3

Digital Hygrometer Thermometer 4-Pack, Mini Humidity Gauge for Humidor, Greenhouse, Reptile Terrarium & Incubator - Indoor Room Temperature Monitor with Fahrenheit by DWEPTU

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