Do You Need a pH Meter to Test Pool pH?

[JimK]

Interesting.

I’m “color blind” (a misnomer). I do fine with the pH test (confirmed by my non color blind spouse), but struggle with the CH test. I have a alternate procedure for CH that you helped me with years ago that helps. Still, I just have my spouse do the CH test for me.

[FormerBromineUser]

When I looked at the Wikipedia article, it said the following about the second image:
Ishihara Plate No. 19 (Nothing (hidden digit plate); Red-Green deficiency sees 2)

[PoolDoc]

Thanks, correction made.

[JimK]

When I looked at the Wikipedia article, it said the following about the second image:
Ishihara Plate No. 19 (Nothing (hidden digit plate); Red-Green deficiency sees 2)

I just see a bunch of dots.