https://www.amazon.com/ThermoPro-TP50-Digital-Thermometer-Temperature/dp/B01H1R0K68/
I’ve had good luck with those cheap ones from Amazon. They seem accurate and the low and high function is really helpful to show you if you have any spikes or dips you might not see otherwise.
I have pretty much the same one as Biologost. But plan on also buying a set of these for my curing jars when it's time:
https://www.amazon.com/dp/B07SJK7FWY/?coliid=IB2KMOSBVQRR5