I already have 2...theres a thread on it...the ones i got(and have 2 more coming) are industrial quality...double crimped and even have high temp shielded conductors that were 24 awg not the skimpy 26 or 28 awg and horrible waterproofing on the 5 for 10 dollar ones floating around everywhere on amazon. These are $12 for 2 sensors and cables are 3 meters. The 2 I already have are within .1F of a NTC 10k thermistor that was calibrated. Im not saltwater, but the stainless probe is real stainless.
Did you have to seal them?