Honestly, a Herpstat is the best and safest for the money.
Even the lowest model Herpstat is great and only $99.
If money is really an issue, you can use a Hydrofarm for $30 at Amazon. Its an on/off type and not as accurate as a Herpstat or other proportional Tstats. Also has a wider temp flux in regulating the heat. I have one on my quarantine rack with no issue. My main racks have Herpstats.
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