First time PH test of the season.

I tried to open my pool today. As people suggest, I tried to use my Taylor K-2006 to do chemical test. However the water is light yellow/light green (full of algea I think). It makes my PH test look like pretty low (acid). btw, my Taylor K-2006 is two-year old, however I always store it in my basement. I just wonder if I need to replace my K-2006 in this case, or how do I do the PH or other chemical test with water having a light yellow/light green color. or should I do SLAM first and do the PH test until it is clear.

thank you.
 
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