I have a couple of Thermworks knockoffs that work well. The really cheap one has a $10 off coupon at Amazon right now making it ~$26.
I also have the ThermoPro TP20 2 channel probe. It works very well too. Amazon says I made the purchase in March of 2018 and its still going.
I also have multi-probe RTD datalogger I made using a Raspberry Pi if you want to build your own along with PID control, lol.
A simple test when getting temperature probes is to to a 2 point temperature check with boiling water and an ice water bath. Make sure not to touch the pot with the probe and you make have to leave it for a bit - especially the ice bath. In an icewater bath your temp probe should read 32 degrees F and 212 in boiling water -- at sea level.
To get the specific temperature water boils where you are; enter the altitude and current barometric pressure into the calculator here:
https://www.thermoworks.com/bpcalc/Some people call this a calibration. I call it more of a spot check or reference check because a 2 point calibration is always perfectly linear which is unrealistic. The would lean more into the calibration realm for a meat thermometer because the two points are at least in the serviceable range. Cooking occurs at higher temps than that.
Cheap one:
https://a.co/d/35vShjOThermoPro TP20:
https://a.co/d/ijxIVHD