I recently purchased a Hanna
pH/EC/TDS/Temp meter (HI98129) and I'm not sure if I can trust its
pH measurements.
I dual calibrated it using the 10.01/7.01 solutions and then measured the
pH of my aquarium water. It gave me a reading of 8.0; this is a little lower than I expected since I did the same test with a new Salifert liquid kit and it was clearly 8.3.
To further make me question the Hanna readings, is that I tested both my tap water and fresh
ro/di water (room temp) with the Hanna and it gave me a reading of 9.0. The Salifert kit read 7.0. It seems that 7.0 makes more sense for fresh
ro/di water, or am I way off base here?
So, which do I trust? Any ideas how I can verify the readings? Should I just get more callibration solution and calibrate again...maybe this time test the solution with the Salifert kit?
I appreciate any insight that anyone can give.
Thank you,
Jason
