How do you use the hannah ph tester?

[Redneck19261]

I have a hannah ph tester and not sure if I'm calibrating it or using it correctly. But my readings are consistent. Just not sure if I'm doing it correct. It's kinda confusing to me lol thanks in advance.

 

[gotmesalty77]

I've got the older one with the screws on top to calibrate it. Do you have anything you could use as baseline ph?

 

[Redneck19261]

I've got the older one with the screws on top to calibrate it. Do you have anything you could use as baseline ph?

You mean like RO water?