one suring I believe the 2ml if for tank water.. The other one is for the liquid.
1) Take your 2ml of water.
2) Add the small spoon they give you of the crystal stuff.
3) Fill the 1ml Syringe with the bottle liquid they give you..
Keep adding drops till you see the change in color. Turn the 1ml syringe upside dorn. Take the reading amount of the liquid that is left. I have .01 left. Then match it to the test kit reading they give you.