Basically you mix yourself reference solutions with known levels of your nutrient, and then see how the test kit responds.
I call it the bucket test.
Fill a bucket with 5 gal of distilled/RODI water, and add enough KNO3 to get to 5 ppm. Take a good sized sample (water bottles work great) and label it. Add KNO3 to get to 10, 15, 20 ppm and repeat the bottling.
Of course you need to figure out how much KNO3 to add, and a way to measure it.
Then you test the solutions with your kit, and compare to your tank water. If the kit shows you clear differences, and the colors match the reference card, then it's a great kit. If all colors sorta look the same, it's more of a common kit.
Keep in mind the premise of EI is to NOT have to do all this testing, and trust the powder and your 50% water changes. Only if you WANT to know the precise levels in your tank, you should make sure the kit is calibrated.
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