American Pin Point PH vs Reefkeeper PH

Ok everyone I would like to get everyone's feedback and experience using both of these equipment. American Pin Point PH Meter and Digital Aquactics Reefkeeper PH Probe.. Here the senerio I'm using both. Both have been calibrated using calibrating solution 7.0 and 10.0. The are both in the same sump AP is reading 7.74 and DA is reading 7.86. There is a difference of .12

Which is more dependable or Accurate ? Is there anyone with prior problems with either of these two? Using a PH test kit is useless as the readings are hard to tell colorwise and I am not color blind. It's more difficult to cage when it's an in between color. I used an API kit but couldn't pin point. Is ther a better kit

Your feedback and vast experience is appreciated. Thanks;D