ahmedess
09/11/2010, 05:14 AM
I have a Hanna pH meter that is giving me wierd readings while calibration. I am trying to calibrate it on pH 7 buffer solution and i turned the calibration screw till the end and i can only get it to as low as 7.5 sometimes its even more. I also have to keep it in the buffer solution for a long time for it to give that 7.5 reading because it always start with a very high pH reading like 10 and 11 somtimes.
I always store it in a pH 7 buffer solution as it is stated in its manual and I always clean it after use. I dont know whats wrong with it.
I always store it in a pH 7 buffer solution as it is stated in its manual and I always clean it after use. I dont know whats wrong with it.