PH tester
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Google soil slurry ph test & you will find lots of info.
The HM Ph-200 as well. I believe that the replacement probe is around $30 maybe cheaper directly through them. At the end of the day I think they're all pretty comparable within their $$ range. I just got the HM PH probe because I had the "matching" TDS meter, and that kicks ass too. Soo....
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I’d really have liked to have purchased the meter that did TDS as well, but the probes are double the money. I couldn’t justify the cost since I do the organic soil thing.
To be honest, I really only check my PPM/EC when I change the dosing of the nutes. After that I pretty much know where I'm at, so I don't check it as much. PH meter gets used way more, so I never really looked at an all in one in case it did shit the bed like you mentioned. IMHO/YMMV/ etc. etc/ all of that.
But I did buy a "cheap" TDS meter once. Anytime the PPM was over 300 it would read 1000+. And couldn't be calibrated. Took me buying some TDS calibration fluid to figure that one out. Up until then I was scratching my head. So I was underfeeding my plants for awhile.
olbobcat
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I have a Bluelab and a Apera with non-replaceable probe it is cheaper, basically the price of a replacement probe. I like the Apera better due to the large reservoir for holding the solution. It is small on the bluelab so if you take a break from using it it will dry out.
i use this style pen for liquid and medium testing. growing organic now only need to ph soil when making a soil mix before starting any plants. Works fine. Have dedicated soil ph pen and don’t like it.
