Hydrofarm is a thermostat that is designed for seedling mats made by hydrofarm. It is a simple on off thermostat. it runs a relay system similar to ranco and johnson. There probe accuracy is very poor but they are contestant. It is not my first choice for a primary thermostat but it makes a good failsafe or back up thermostat. It is quite inexpensive (I feed more money in rats every week) so it is not cost prohibitive to have just being a back up.
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I agree that a good t-stat is worth its weight in gold. I personally feel that purpose made ones are best as they are designed to do what you expect them to. That is not really part of this debate. A failsafe thermostat additional protection cannot be under rated. The issues that make a cheap thermostat poor are not so critical as a back up if it isn't as accurate as it could be and if it tends to swing temps isn't very critical as a failsafe it will do until the primary can be replaced. I'd suspect an breeder of size has a spare T-stat or two sitting on a shelf waiting to be needed.
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