Red Sea Reef Foundation Test Kit - Calcium, Alkalinity & Magnesium

Recieved two bottles of A for the calcium test, how do I get a bottle of B?

How accurate is this kit? Planning on switching from Salifert as I think this will reduce my costs some, seems easier to use with hand tool?

Is there a refill kit for these tests with just the Titrant’s and Reagent’s?

by other reviews, do these kits still contain the recalled calcium reagant? These are the faulty batch numbers. Thanks