Hanna PH Meter

i use there ppm meter it was really cheap and it works great..but i dont know about their ph meters..hanna makes a good product though so
 
I have a hannah PH probe (single probe about the size of a pen). Most of them come with a pack of 7.01 solution to calibrate it. You will need to calibrate it every once in a while to ensure proper readings. Its really simple and makes giving nutes so much easier.
 
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