K Test is a test for fast and accurate measurement of potassium in aquarium water.Healthy growth and good-looking plants are only possible with enough potassium in the water. A lack of potassium stops plant growth and leaves start to break down. Too much potassium blocks the uptake of calcium and ammonium nitrogen, which can lead to unwanted algae.Recommended potassium level in planted aquariums: 8-17 mg/l.Read the detailed instructions before use.INSTRUCTIONS:1. Rinse the test vial with the water to be tested.2. Use the syringe to draw 5 ml of water and add it to the test vial.3. Add 5 drops of reagent No. 1.4. Shake for 15 seconds.5. Add one level spoonful of reagent No. 2.6. Shake for 15 seconds and wait 5 minutes.7. After 5 minutes, shake again for 5 seconds.8. Read the result with the comparison scale.Instructions for the comparison scale are in the app and in every box!Wash the test vial thoroughly right after measuring potassium.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!