Review on Precision Hydroponics Test & Measure Instrumentation for Accurate Aquarium and Substance Analysis by Isaac Maze
It just doesn't work.
I mean it reads a number but it can't be exact. Tried to calibrate. Just jump to 4.0 no matter what I do. Out of reach. I compared it with a real test set. I knew digital was too good to be true. The seller offers a $30 gift certificate when I contact them. I didn't spend that much on the counter. It does not make sense.
- pH test
- Big and bulky
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