PH Tester?

Have had this one 2 years still good to go easy calibration and water proof so no worries if you drop it in your res.
 

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do they make a submersible one you can just drop in the tank?
The one in my photo i drop in the tank all the time it floats at the top so if im adjusting ph and i get side tracked i just drop it in the res and come back for it. If you mean a ph meter that you can just throw in and leave it in no. Thats what a tri-meter is for. A tri-meter will have probes that go in your res and a display that mounts to your res lid or the wall. It will show you resevoir ph, tempereture, and ppm. A basic try meter will run you about a Bill.
 
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