They look pretty good.
You just extract (pump, turkey baster, big syringe) or pour the runoff out of the saucer into a small cup or bowl and use whatever method of pH testing that you normally use. Test your water before it goes in then test the runoff and you'll have an idea of where your pH is in the soil. Those old bottom leaves that are dry and ugly won't recover, you can sometimes bring green back to yellowed (lack of N) leaves but once they get brown, black, bronze or yellow spots or get crispy, the damage is irreparable and all you can do is diagnose the issue and correct it as soon as possible. Once you get it figured out and fixed the plant will stop showing more bad signs but the affected leaves will always be damaged. After the spreading stops, if there's >30% of the leaf compromised, I remove it.