ULR vs LR vs HR

[Hjnlssmith]

I have been using the API manual test kit for my tank so far. I have a fish-only saltwater tank and have been using the test kit for pH, Nitrate, Nitrite and Ammonia.

I want to try a digital checker like the Hanna series but I notice that they have ULR, LR and HR options for several of their checkers. Is there a simple guide out there that identifies which option is best for me and my type of tank?

Thanks

 

[Troylee]

Lr or hr is fine.. the ulr is good for reefs where we flirt with bottoming out nutrients lol..