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Test a EC or PPM meter
DeadwebsiteBoringcommunityanswered grow question 4 years ago
You use calibration solution or two different EC/TDS. Ie you test/calibrate with a 700ppm then you test/calibrate with a 1000 ppm solution.. Then you recheck your readings with your calibration solutions to see how accurate your pens are.. Here's a link to a company that sells the calibration solution. Cheap or Expensive all TDS/EC meters need to be calibrated once a month or so. :http://hmdigital.com/product-category/accessories/calibration_buffers_storage/
Chow_13answered grow question 4 years ago
I don't see any ppm or ec listed on the labels. I dont have a ro system. but i do have a zero water pitcher. The water that comes from measures 0. the charts i find for my nutes shows a ppm range and no ec.
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NobodysBudsanswered grow question 4 years ago
there are 2 ways to calculate EC. If dividing by .5 doesn't match up with ppm, divide by .7 and see if that corrects it.
if yo have a nice RO system, you can mix up some measured amount of nutes and calculate what the PPM should be from the guaranteed analysis labels. then, compare. A really good RO system wil be near 0 ppm, if not mistaken? if not, that's what you'd need, then mix and measure.. start with a known.. compare measurement. easy as pie.
look into re-callibrating, if that's something necessary for those pens. that'll also verify integirty.
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