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 Temperature Controller 68-108 ºF for Seedlings, Germination, Rooting, Fermentation and Reptiles

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

Product ID: 255224687

Details

Brand
VIVOSUN
Colour
Thermostat
Display type
LCD
Material
Plastic
Voltage
230 Volts

🔌Universal plug compatibility

🌡️Precise temp control 40-108°F

🛠️Durable rust-proof plastic

Description

🌱 Heat your roots, not your worries — grow smarter, not harder!

BUILT TO ENDURE - Hexagonal, extra-fortified plastic housing resists rust and wear in any grow environment.
CLUTTER FREE OPERATION - Integrated hanging tab and angled socket keep cords neat and your workspace sleek.
PLUG PLAY COMPATIBILITY - Works seamlessly with any heat mat and standard North American outlets—grow without limits.
EFFORTLESS SETUP CONTROL - Three-button interface lets you dial in temps or switch °F/°C in seconds—no manual needed.
PRECISION TEMPERATURE MASTERY - Maintain your ideal root zone from 40 to 108°F with laser accuracy.

The VIVOSUN Digital Heat Mat Thermostat offers professional-grade temperature control from 40 to 108°F, perfect for seedlings, rooting, fermentation, and reptile habitats. Featuring a durable, rust-resistant design and an intuitive 3-button interface, it ensures precise, reliable heating with minimal setup. Compatible with all heat mats and North American outlets, it keeps your growing environment perfectly balanced and hassle-free.

Specifications

ASIN	B015F4VFGI
Brand Name	VIVOSUN
Color	Thermostat Controller
Customer Reviews	4.5 4.5 out of 5 stars (5,923)
Display Type	LCD
Included Components	thermostat
Manufacturer	VIVOSUN
Material Type	Plastic
Model	330101
Operating Temperature	40 Degrees Fahrenheit
Part Number	330101
UPC	742920469641
Unit Count	1 Count
Voltage	230 Volts

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