
PH. The counter is calibrated. many times. Constantly inaccurate. Tested with pH-Power in distilled water and compared to the new "brand name" pH meter. If the device is idle, the pH value continues to rise. The other 2 meters are fine. *Water plants with incorrect pH up/down. Leads to pH blocking. A nutrient vampire in a plant. Brown spots, leaf curl, leaf fall. In my opinion, if you care enough about your plans, buy a counter. Spend a few dollars more. Buy a brand that has a guarantee.

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