how to switch from °F to °C?

Hold down on the up and down buttons at the same time

how many mats can be connected to this?

I have used these with a power splitter outlet into 2 mats and they work fine. The controler applies power till the programmed temperature is achieved then shuts off. Unit will cycle to maintain temps. I've heard the mats burn out frequently but with a controller I've never had a problem. I usually set for 54°F and tomatoes, peppers, tobbacco, leeks love it some plants pop up in 24 hrs. usually 2-3 days. A small low velocity fan will prevent damping(mold/mildews). Do not shut off heat and fan or damping will take hold in less than a day. And do not use anything other than sterile medium for seedlings/starts No fertilizers for couple weeks and definately no contaminates azomite will introduce spores/damping.

Is this a thermostat with a mat or does it work with any other mat?

It is just a thermostat. It works with anything heat outputting, like a heating lamp. The probe senses the temperature and turns the power on or off to whatever you plug into it.

Is the probe ok with saltwater ??

Instructions state "do not immerse temp probe in liquid" so no .

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Digital Heat Mat Thermostat Controller, 40–108 ºF 1000W for Reptiles, Seedlings, Germination, Incubation and Fermentation

Product ID: 18764081

Details

Brand
VIVOSUN
Color
Green
Display Type
LCD
Material
Plastic
Voltage
230 Volts

⚡Supports up to 1000W power

🔧Durable rust-proof plastic

🌡️Precise 40-108°F control

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€ 43.28

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Sold byAmazon AustriaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌱 Heat it right, grow it bright—control your environment like a pro!

BUILT TO ENDURE - Crafted from fortified, rust-resistant plastic with a smart hexagonal grip—engineered for longevity in any environment.
TIDY CONVENIENT SETUP - Includes hanging tab, wall mount, and angled socket to keep your workspace sleek and cords tangle-free.
EFFORTLESS 3 BUTTON CONTROL - Set and switch between Fahrenheit and Celsius in seconds—no manual needed, just instant temperature command.
PRECISION TEMPERATURE MASTERY - Maintain your ideal climate with an ultra-accurate 40-108°F range—perfect for delicate seedlings or sensitive reptiles.
UNIVERSAL COMPATIBILITY SAFETY - Plug-and-play with any heat mat and North American outlets—safe, reliable, and ready to power your growth.

The VIVOSUN Digital Heat Mat Thermostat Controller offers precise temperature regulation from 40 to 108°F with a 1000W capacity, ideal for reptiles, seedlings, germination, incubation, and fermentation. Featuring a durable, rust-proof design and intuitive 3-button operation, it ensures effortless setup and reliable performance. Compatible with all heat mats and North American outlets, it’s a must-have for professional horticulturalists and serious growers seeking consistent, controlled environments.

Specifications

ASIN	B015F4VFGI
Best Sellers Rank	#30,428 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #308 in Greenhouses & Plant Germination Equipment
Brand Name	VIVOSUN
Color	Green
Customer Reviews	4.5 4.5 out of 5 stars (5,734)
Display Type	LCD
Included Components	User Manual
Manufacturer	VIVOSUN
Material Type	Plastic
Model	330101
Operating Temperature	40 Degrees Fahrenheit
Part Number	330101
Smart Home Compatibility	Not Smart Home Compatible
UPC	742920469641
Unit Count	1.0 Count
Voltage	230 Volts
Warranty Description	1 Year

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