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The trouble is that you're looking for a "TDS calibration solution", not conductivity, and the electrical conductivity of KCl and NaCl solutions at the same concentration are not the same.You'd be much better off buying some distilled water and using it for your "zero" concentration, then mixing a fertilizer in it at a known true concentration, and measuring what your meter tells you.I documented how I did that many moons ago.
The trouble is that you're looking for a "TDS calibration solution", not conductivity, and the electrical conductivity of KCl and NaCl solutions at the same concentration are not the same.
You'd be much better off buying some distilled water and using it for your "zero" concentration, then mixing a fertilizer in it at a known true concentration, and measuring what your meter tells you.
I documented how I did that many moons ago.
