I bought a probe style meter from amazon as well. Didn't wanna fork or 80 bucks so I spent 35. Unfortunately as with any amazon product as it continues to trend up the price goes up. It now cost as much as a hanna at 85I bought a cheap PH meter....to see if I could work it.........then I upgraded it to a Hannah.....as recommended on AFN at the time.....
The cheapie was great...for about 8 years...the Hanna was Crap......
Arrived Broken ...one of the buttons was Sticky/faulty and wouldnt switch on...the replacement wasnt much better.....
I don't PH my plants.......I use it for PH-ing the humans.........
The depicted one is their plain long stem ph tester but mine came with a conical shaped tip. Not this little knob. I like this one because the stem goes straight into the storage solution bottle. No need for a cap. The bottle is the cap