Review on VIVOSUN 3-in-1 Digital pH Meter: High Accuracy, ATC, 0-14.0 pH Range by Stacy Steckler
Hydroponic Pen 3 in 1
Vivosun 3-in-1 pen. It would get a 5 star rating if it came with all the necessary calibration solutions. The pen is very accurate, I easily calibrated the pen by simply following the instructions. When delivered, the PPM calibration was correct. I bought a separate solution to test this for accuracy. (The only reason I had to give them 4*). Batteries included!
- Everything is fine!
- Hard to say
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