I have a Hanna Checker for calcium and it usually gives me 450-500. I also have a DA reefkeeper pH probe that usually reads about 7.9. I took my water to my LFS today and calcium was like 370 and pH was 8.3. I just moved and am losing a few things so I am trying to figure this out. Don't know which ones to trust. The LFS had API test kits and they were brand new.