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Calibrate ph pen?

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    #16
    bdeegan It's fun to see all the old names pop up on these old posts. With that being said, just stick your pen in a cup of milk if it reads 6.8 or 7 you're close enough to grow weed.

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      #17
      Check out the original post date, y'all folks.
      C'mon, mule!

      Coco/perlite
      3x3x6

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        #18
        Gingerbeard I think by using the search function for a certain subject, it digs in the archives.

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          #19
          I started with the “Amazon” brand PH tester with the 3 fluids etc. Given what a difference the ph has on plant health, moving to a Blue Labs or Hanna brand quality tester was a no brainer.

          If you have the cheap one calibrate as often as you can bare following their instructions. I found mine to be pretty unreliable once I had a good one to check it against.
          KIS mix organic living soil from Black Sallow soils in 7gal. pots
          Black Swallow Organic Bloom mix top dress before flower.
          Reusing soil with Black Swallow nutrient pack between grows
          Maybe some compost teas
          Blumat watering system
          Microbial Mass and other microbial boosters(Wallace)
          3x4x6’ tent
          Photontek 465wpro
          6” AC Infinity outdoor air in and out, humidifier, dehumidifier, heater, oscillating fan.
          Inkbird controllers heat/humidity​

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            #20
            I started with the soil probe pH/water meter, they are junk. Went to an eBay cheap pH pen they are junk too. Got a Apera Instruments AI209 PH20 and it's a good one. Some have replaceable bulbs but cost more so it's a cost issue. The PH20 does not. They last about 3 years. it can be calibrated at two or three points. Easy to do.

            Always keep some liquid over the bulb when in storage. I use the 7.0 and 4.0 calibration fluid. I buy a liter at a time and it last for a couple years. Never pour anything back in the original pH calibration solution bottle.

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