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I'm having the same issue. Was wondering how my pH went from ~7.8 at night, to ~7.0 the next day without adding any chemicals. I typically only test at night and in the same spot, so I've just come across the problem. At dusk, I can test in different spots in the pool with varying sun exposure...

Oh, I always thought the idea what to eliminate any sunlight while doing the test hence turning your back to the sun. I guess I will need to buy more R-7065 and R-0013 and try these alternative methods.

I was going to create my own thread and then found this one which sums up my issues quite nicely. I hope everyone doesn't mind if I piggyback. I too am having issues with inconsistency even with the standard. Below are some pics with R-7065, which I based on my testing read 25. The pics in order...