problem with accuracy of PH IN ALL MY RECIPES

[Brews Bros]

HI GUYS , I M HAPPY WITH THIS APP BUT
REGARDING THE PH ESTIMATION , THE REALITY IS I M ALWAYS 0.4/ 0.5 POINT FAR FROM REALITY
OK I COMPENSE NOW BUT AM I YHE ONLY ONE FACING THIS
OK OK , I CHECK MY WATER IN LABORATORY BLA BLA BLA , USE DIFFERENT TYPE OF PH METER TO CONFIERM CALIBRATION BLA BLA BLA
THANKS GUYS

 

[Ozarks Mountain Brewery]

HI GUYS , I M HAPPY WITH THIS APP BUT
REGARDING THE PH ESTIMATION , THE REALITY IS I M ALWAYS 0.4/ 0.5 POINT FAR FROM REALITY
OK I COMPENSE NOW BUT AM I YHE ONLY ONE FACING THIS
OK OK , I CHECK MY WATER IN LABORATORY BLA BLA BLA , USE DIFFERENT TYPE OF PH METER TO CONFIERM CALIBRATION BLA BLA BLA
THANKS GUYS

all caps is on your keyboard, please correct

 

[Yooper]

HI GUYS , I M HAPPY WITH THIS APP BUT
REGARDING THE PH ESTIMATION , THE REALITY IS I M ALWAYS 0.4/ 0.5 POINT FAR FROM REALITY
OK I COMPENSE NOW BUT AM I YHE ONLY ONE FACING THIS
OK OK , I CHECK MY WATER IN LABORATORY BLA BLA BLA , USE DIFFERENT TYPE OF PH METER TO CONFIERM CALIBRATION BLA BLA BLA
THANKS GUYS

It's never off for me, usually if it is it's within 0.05 or so. When you check the mash pH, at what point are you checking it?

 

[Minbari]

What do you use to check ph?