LOL!
I just did some testing. Pool and tub. Used the OTO and the DPD. I can read the yellow OTO a little easier than I can read the pink DPD. Maybe I have a little of that red green color blindness. I bought the DPD comparator block that reads FC to 10 because I thought it would be better than the OTO that only reads to 5. But I can do better reading the darker shades of yellow. It would be good if Taylor made an OTO test block that goes to 10. Of course, if it went to 11 that would be better! :-D
I just did some testing. Pool and tub. Used the OTO and the DPD. I can read the yellow OTO a little easier than I can read the pink DPD. Maybe I have a little of that red green color blindness. I bought the DPD comparator block that reads FC to 10 because I thought it would be better than the OTO that only reads to 5. But I can do better reading the darker shades of yellow. It would be good if Taylor made an OTO test block that goes to 10. Of course, if it went to 11 that would be better! :-D