I’ve been using a broken ph pen.
I cleaned it and calibrated it with 7.0-4.0 solutions.
It will read 8.0 when two other meters know to be correct show 6.5.
As a result I’ve been watering way too acidic around 5.
Leaves are discolored and showing brown spots and purple edges.
How do I water now? Should I just resume 6.3 or overcompensate a little too correct the ph?
I just did a light foliar feed 1 ml cal-mag and 2 ml 6-4-4 liquid grow.