hanna checker question

[Eddie7144]

Hey all, my hanna phosphate checker is driving me nuts, I keep getting different readings every time I test. It will read .02 then .08 then .12 all within 5 minutes of each test. Is it not very accurate or am I doing something wrong? Or can someone recommend a better test kit ? Salifert maybe ? Help me please

 

[twilliard]

Are you making sure there are no smudges on the glass and inside is bubble free (micro bubbles)?

 

[JimWelsh]

I have not used the Hanna phosphate checker, so I cannot comment on it, but I really like the Elos Phosphate Pro test kit.

 

[Eddie7144]

Yes I wipe the vial down, and tap it to lose the bubbles, idk