I agree with the other reviewer, the grout is applied thinner so it's a bit harder to see the color than in the suction cup (which holds more grout) Also - and it might be my hard water - but there The water hole is much smaller, I had a surface tension bubble mold at the bottom of the drop tester that prevented the replacement needed to change the color. I pulled out the checker and popped the bubble, and then it seemed to pop again. All in all, I think I'll return to the suction cup checker because it was easier to read.
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