Aha. I suspected there might be more to the diagnosis than pH, but didn’t think it would turn out to be irrelevant. It’s good we have experienced people like Caligurl, who can diagnose based on the plant’s appearance, rather than having to rely on measurements.
The procedure I described, involving watering until the runoff measures correctly, should help solve your problem, but you’ll be looking for a ppm target rather than pH.
The ppm pen one of our other experts (Lostgirl) recommends is this one (5 in 1 version). The same one is also available here at a much lower price if you don’t mind ordering things directly from China.
@Caligurl: Thanks for continuing my education. Is one of your photos a “pH too high” and the other a “too low?”
Also, there’s a question waiting for you at the bottom of this thread.