Product review (4 stars): Maybe it works, maybe it doesn't.
I have no idea how this works, nor whether it works well or badly.  I change it out because the YouTube video says it "could" be the culprit for freezes and water buildups in this Samsung fridge. The fact that the problem keeps arising tells me the whole design of the fridge is meh.  The point is that I don't know if this sensor works or not because the drain system that lets the defrosted water out keeps clogging, backing things up and causing this device to be of little use in that situation.  So, does it do its job?  Maybe. Does the overall design of the defrosting system work?  Not well.  Is it a pain in the butt to replace and install?  Major!  You have to have some serious handyman skills to even attempt to install it.  I do, and it has saved me $$ on unneeded service visits (roughly $200 per fix I estimate), but I'd prefer a better designed fridge.  That will be the next replacement, not the temp sensor.