accurate

I was wondering if there was any Salinity testing equipment that actively reads Salinity in real-time, I use the Hanna Salinity Checker which I really enjoy but sometimes I get the feeling that it's not as accurate as a Refractometer.

I’m looking to find a accurate and reliable ph probe that is NOT from Neptune, BRS or GHL but I can’t seem to find much about them online, when I search for it all that pops up is what the best ph meters are, but I’m specifically asking about a ph probe with the BNC connector on it