Are you sure? The probe on this one says it’s made for aquariums and it doesn’t look like it has any stainless steel that would be exposed?That doesnt have an aquarium safe probe either.
You need this one. LINK
The probe has to be plastic or covered in silicone. Stainless steel is not free from rust. Probably wont be a problem but it is a potential source of heavy metal contaminants down the road.