I just purchased a TF-Pro test kit.
I'm attempting to adjust the PH-009(I)A PH meter.
I added the entire packet of ph6.86 solution powder into 250ml of water at 25°C, and mixed until the powder was fully dissolved.
I then inserted the Pen PH Meter into the mixed solution up to the immersion level. The meter read a PH of 5.5
Using the provided screwdriver, I rotated the adjustment trimmer in both directions. The reading on the meter changes rapidly and randomly while the trimmer is being rotated. When I stop rotating, it returns to 5.5
When removed from the water, it reads a PH of 14, at all other times, the PH is 5.5 and does not change.
Is the meter defective? And should I even be using it, since the kit comes with the TF-Pro view tube and assorted chemicals?
I'm attempting to adjust the PH-009(I)A PH meter.
I added the entire packet of ph6.86 solution powder into 250ml of water at 25°C, and mixed until the powder was fully dissolved.
I then inserted the Pen PH Meter into the mixed solution up to the immersion level. The meter read a PH of 5.5
Using the provided screwdriver, I rotated the adjustment trimmer in both directions. The reading on the meter changes rapidly and randomly while the trimmer is being rotated. When I stop rotating, it returns to 5.5
When removed from the water, it reads a PH of 14, at all other times, the PH is 5.5 and does not change.
Is the meter defective? And should I even be using it, since the kit comes with the TF-Pro view tube and assorted chemicals?