Bought a Hanna pHep5 98128 and have used it on two beers trying to get my mash pH right. I'm not entirely happy with it because right after I calibrate it, if I put it back in the 7.01 solution it can be off by as much as .1 (specs say that it's accurate to .05) then drift over the next 5 minutes.
I've never used a pH meter so I'm hoping someone can take a look at this and tell me if what I'm seeing is normal or if there's something wrong with this one. I will say that when I measure actual mash pH, it does not seem to drift, but because of what I see when measuring the calibration solution, I'm wondering if those readings are accurate.
The measurements below were taken after calibrating the meter in 7.01 and 4.01 solutions. After each test the probe was rinsed with water & as much liquid as possible blotted off.
Edit:Not sure if everyone else is seeing the red x instead of the screenshot, but here's what's shown when measuring 7.01 solution after calibrating:
Time pH
Initial 7.11
5s 7.13
10s 7.11
15s 7.10
30s 7.09
45s 7.08
1m 7.07
1.5m 7.05
2m 7.04
2.5m 7.04
3m 7.03
3.5m 7.02
4m 7.02
4.5m 7.01
5m 7.01
10m 7
I've never used a pH meter so I'm hoping someone can take a look at this and tell me if what I'm seeing is normal or if there's something wrong with this one. I will say that when I measure actual mash pH, it does not seem to drift, but because of what I see when measuring the calibration solution, I'm wondering if those readings are accurate.
The measurements below were taken after calibrating the meter in 7.01 and 4.01 solutions. After each test the probe was rinsed with water & as much liquid as possible blotted off.
Edit:Not sure if everyone else is seeing the red x instead of the screenshot, but here's what's shown when measuring 7.01 solution after calibrating:
Time pH
Initial 7.11
5s 7.13
10s 7.11
15s 7.10
30s 7.09
45s 7.08
1m 7.07
1.5m 7.05
2m 7.04
2.5m 7.04
3m 7.03
3.5m 7.02
4m 7.02
4.5m 7.01
5m 7.01
10m 7