crap looks like PH lockout... is it?

I was away from my plants for a couple of weeks had someone tending my plants and I think they threw off my PH... horribly... do these plants look locked out to you? first couple of leaves look like Mag def... and the third looks like near nitrogen lockout (first and 2nd pic plant was in flower 3rd pic plants are in veg)

and in emergency will a pool's liquid ph test formula that sell at wal mart for 3 bucks work?

No it look like over water back off water for 5 to 7 days good luck