Test kit advice

[splatshot]

Currently using Salifert Ca test kit and it sounds like I also need to get a Magnesium test kit. Any recommendations ?

 

[psu]

I just got Red Sea--only used it once. Mine came out high at 1580 for mag and had my lfs test my water and it came out 1700 w/ their test--not sure what brand they use--I like it so far. Was using AP for all other but numbers way different from lfs that tested w/ Sailfest so I just ordered Elos for Cal, Ph, and Alk. Can't wait to test w/ those.