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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VIVOSUN 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

🌡️Precise 40-108°F control

🛠️Durable rust-resistant plastic

€ 43.82

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Sold byAmazon SlovakiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌱 Master your microclimate—grow smarter, not harder!

BUILT TO LAST - Crafted from fortified, rust-proof plastic with a hexagonal grip design for reliable, long-term use under tough conditions.
EFFORTLESS OPERATION - Set and switch between Fahrenheit and Celsius in seconds with just 3 intuitive buttons—no manual needed.
NEAT CONVENIENT SETUP - Includes hanging tab, wall mount, and angled socket to keep your workspace organized and cords tangle-free.
PRECISION TEMPERATURE CONTROL - Maintain your ideal environment with a 40-108°F adjustable range for flawless germination and incubation.
UNIVERSAL COMPATIBILITY SAFETY - Works seamlessly with any heat mat and plugs into standard North American outlets, backed by a 1-year warranty.

The VIVOSUN Digital Heat Mat Thermostat Controller offers precise temperature regulation from 40 to 108°F, supporting up to 1000W power for optimal reptile care, seedling growth, germination, incubation, and fermentation. Featuring a durable, rust-resistant plastic build and an easy-to-use interface with an LCD display, it ensures professional-grade reliability. Designed for convenience, it includes mounting options and compatibility with all heat mats, making it a must-have for serious growers and hobbyists alike.

Specifications

Asin	B015F4VFGI
Best Sellers Rank	#9,508 in Patio, Lawn & Garden (See Top 100 in Patio, Lawn & Garden) #221 in Greenhouses & Plant Germination Equipment
Brand Name	VIVOSUN
Color	Green
Customer Reviews	4.5 4.5 out of 5 stars (6,230) 4.5 out of 5 stars
Display Type	LCD
Included Components	User Manual
Manufacturer	VIVOSUN
Material Type	Plastic
Model	330101
Number Of Items	1
Operating Temperature	40 °F
Part Number	330101
Unit Count	1 Count
Upc	742920469641
Voltage	230 volts
Warranty Description	1 year.

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€ 43.82

Duties & taxes included

In stock

Sold byAmazon SlovakiaDelivered 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 Slovakia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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