accurate

hey saltwater fish gang, i was just wondering how inaccurate is the API testing kit? i have a fish tank that i’ve been testing with API but I’ve read from past experiences that Ammonia is usually super inaccurate, but what about the rest? PH, Nitrite, and Nitrate? are those a bit better? I...

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