To follow up with Ranco mentions above, I highly recommend Ranco over inkbird. Ranco is industrial grade and inkbird is FAR from industrial grade. inkbird is cheaper throw away grade in my experience.
I have not owned an inkbird temp controller for aquarium use. I have used and Continue to use many other inkbird temp controllers though. I use them for my smoker and also modified freezers and refrigerators for wine making and beer making. They work reasonably well but I’ve had a couple temp probes fail. I personally would not trust them for my reef tank. If I lose a batch of beer, or over cook a brisket, so be it. I’ll buy another temp probe and make another brisket. If it failed and my fish died I’d never forgive myself!
I know lots of people use inkbird and love them. My experience is just my experience and not meant to be trashing inkbird because I do like them for what they are.
if you do want an inkbird, they have many sales reps on Facebook and elsewhere. You can send them a message and they will send you 50% off code. I’ve never payed more than 50% for any inkbird product.