Using Electrical Conductivity and Total Dissolved Solids Meters to Field Test Water Quality

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Tom Scherer, NDSU Extension Agricultural Engineer demonstrates how to use an electrical conductivity meter and total dissolved solids meters to field test water quality.
Link to the NDSU Extension publication:
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A 1/4 tsp of salt weighs about 1.5 grams, per google. 4 cups of water is essentially a Liter or so. So 1.5 grams in a liter would be 0.15%, right? Why is the correct value not 1500 ppm? What am I missing?

philipbowman