PH AT 0000

I HAVE TWO 5 GALLON BUCKETS AND AS OF THIS WEEK ONE OF THEM READS 0000 PH BUT MY PEN IS GOOD I CHECKED WITH BUFFER POWDERS AND ITS ON POINT . . . . HAS ANYBODY EVER HEARD OR SEEN THIS IF SO PLEASE HELP

Re calibrate pH pen and retry..

I ENDED UP TRASHING MY GROW BECAUSE THEY ENDED UP BRING MALES