Salifert KH test kits.

Not sure if you're pulling my leg. But just in case your not.

Just pretend the reference solution is your tank water.

Put 4ml in the sample vial.Add 2 drops of blue/green reagent. Fill syringe with titration soultion . Dispense into vial until color change. Read the syringe. It should read 8.0 if that's the number on your reference solution. Mine does.
 
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