Why is only 2 point pH calibration available.

[Brian71583]

Can’t seem to find a thread on it.

EZO board from Atlas with and Atlas Scientific lab grade probe. All functional. When I go in to calibrate it I only have 2 points available. How do I do a 3 point calibration?

 

[MarineandReef Jaron]

Can’t seem to find a thread on it.

EZO board from Atlas with and Atlas Scientific lab grade probe. All functional. When I go in to calibrate it I only have 2 points available. How do I do a 3 point calibration?

You are using a meter that is not very common in the Hobby. Generally 2 point calibration is considered accurate for our application. You want to calibrate as close to the estimated measurement as possible so most people use a pH 7 solution and a pH 10 solution to calibrate a probe used for measuring seawater pH. While pH 4 solution is available. It is so far from the anticipated value of seawater that adding a pH 4 solution into the calibration may actually result in less accurate results.

 

[Brian71583]

You are using a meter that is not very common in the Hobby. Generally 2 point calibration is considered accurate for our application. You want to calibrate as close to the estimated measurement as possible so most people use a pH 7 solution and a pH 10 solution to calibrate a probe used for measuring seawater pH. While pH 4 solution is available. It is so far from the anticipated value of seawater that adding a pH 4 solution into the calibration may actually result in less accurate results.

Thanks. I was just going off the reef-pi pictures and tutorials that all show 3 point calibration and mine only displays the ability for 2