Hanna Ph pen

So i recalibrate my Ph pen using the 4.01 and 7.01 solutions. I did the 7 first then the 4, i also have the 10.01 solution but i use either the 4 or the 10, i used the 4 because well my ph is going to be right between 4 and 7 so i figured that would be the most accurate calibrating method. Once all is set and done, i wanted to test how well it was calibrated so i put it in the 10.01 solution and it reads out 9.73.... Is that bad? or is it just calibrated for the low ph? and not for the high ph? the Ph stays level and fluctuates about .01 sometimes/barely so i know the electrode is still good. A side note, the ph 10 solution packet busted open in the package, luckily it was the only one, and all the 3 were sealed together inside another bag. So i just poured it into a small jar i have, maybe the ph dropped? Either way i have the chemical test kit aswell and it reads yellow with slight tint of orange indicating a ph of about 5.8-5.9, the ph pen reads out 5.86 so i think its ok to use.

if u have the hanna red pen it need's to be calibrated with 7.01 solution. i use gh brand 7.0 it ses error fault or something like that but it gives perfect readings.as far as the difference.its not much,and i wouldnt worry about it.

I'm using a two point calibration pen, specifically the Hi 99104.

You should be good to go on the 2 point calibration. My Hanna's PH probe only last alittle over a year with cleaning, calibration and daily use. They cost half what the pen cost to replace. If it checks with the 7.01 your good.

well for one it could of been contaminated when it busted open and 2 temp of the solution effects the ph read the pack it has all the suttle changes listed.