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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🌱 Grow smarter, not harder—control your roots like a pro!

BUILT TO ENDURE - Hexagonal, extra-fortified plastic housing resists rust and wear, built for long-term reliability.
CLUTTER FREE SETUP - Includes hanging tab, wall mount, and angled socket to keep your workspace sleek and cords tangle-free.
PLUG PLAY COMPATIBILITY - Works seamlessly with any heat mat and standard North American outlets—start growing instantly.
EFFORTLESS CONTROL INTERFACE - Set and switch between °F/°C in seconds with just 3 intuitive buttons—no manual needed.
PRECISION TEMPERATURE MASTERY - Maintain your ideal root zone with a 68-108°F range for flawless germination and growth.

The VIVOSUN Digital Heat Mat Thermostat offers precise temperature regulation from 68 to 108°F, ideal for seedlings, rooting, fermentation, and reptile care. Featuring a durable hexagonal design, easy 3-button operation, and universal North American plug compatibility, it ensures professional-grade reliability and effortless setup for serious growers and hobbyists alike.

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€ 119.93

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Operating temperature	4E+1 Degrees Fahrenheit
UPC	742920469641
Manufacturer	VIVOSUN
Part number	330101
Item Weight	384 g
Product Dimensions	10 x 10 x 25 cm; 384.3 g
Item model number	330101
Size	68-108 Fahrenheit
Style	Indoor Installation
Shape	Hexagonal
Power source type	AC
Volume	2050 Cubic Centimetres
Wattage	20 watts
Item Package Quantity	1
Plug profile	Wall Mount
Specification met	UL
Special Features	Digital
Specific uses	Temperature Display
Included components	User Manual
Batteries included?	No
Batteries Required?	No

VIVOSUNDigital Heat Mat Thermostat Temperature Controller 68-108 ºF for Seedlings, Germination, Rooting, Fermentation and Reptiles

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