Yellowing fan leaves early in flower

I have a measuring cup which I fill with solution and take cap off fill cup with enough to submerge tip

@Donaldj the meter with the push button calibration do you have a brand and model number? I’m thinking of upgrading!

@bob31 I swear by my Bluelab meters. Once a month the check marks will disappear letting you know it’s time to clean and calibrate them. The ph meter has the storage solution inside the cap which you hang up when done using. They each have a cleaning and calibration kit available.

Thanks brother I will check those out!