1. Rinse the test vial several times with the water to be tested.2. Fill the test vial with 5 ml of the water to be tested.3. Add 5 drops of reagent No. 1 and shake vigorously.4. Add 5 drops of reagent No. 2 and shake vigorously.5. Add 5 drops of reagent No. 3 and shake vigorously.6. Wait 5 minutes and compare the colour with the colour chart provided.Wash the test vial thoroughly right after measuring copper.Do not let the indicator solution or tested water get into the aquarium!For an accurate result, the water being tested should be 25±3°C and the room temperature at least 20°C.Shelf life: 24 months, but no more than 12 months after opening.Store at 10-25°C in a dry, dark place! Keep out of reach of children!Avoid skin contact with the solutions! In case of contact, rinse with plenty of water!