Best ph meter well best bang for the buck?

I have a cheap 8 dollar pen analogue meter and it tells me my soil is at 6.5 ph which from what I understand is ok for canabis. However I have some plants showing ph type issue. Tips are curling and very dry and brittle. I just add some 12-4-8 food for the first time yesterday since I some some beginning signs nute of issues like little yellow or lighter green spots on some of the broad leaves. Now I'm scared I over nuted so I flushed the questionable plant today.
 
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