Different readings on test kits for PH.

[zero26]

Heres another question, just did all my tests. Getting a different reading here for the PH. My api reads 7.4 and my Red Sea reads 8.2 which should I believe?

 

[gypsana]

Could not tell you. The only sure fire way of finding out which one is good is to take your water to a LFS and get it tested there to see which one coincides.

 

[blenny]

Make sure you shake the bottles real well before testing, And have a good clean vile to test in, Then try again.