Quick test to determine the nitrate content in freshwater/marine aquariums and ponds. Determines the optimal nitrate value for perfect plant growth or possible cause of algae growth in freshwater and marine waterLaboratory comparator system to compensate the inherent water colour: fill glass vials with sample water, add reagents to one vial, place vials in holder, read values off colour chartUse: when setting up a new freshwater aquarium: 1 x weekly. When setting up a new marine aquarium: 1 x weekly. With green algae problemsYou will find detailed information and troubleshooting tips about water analysis on the JBL website in Essentials/Aquarium or PondPackage contents: 1 nitrate test for approx. 40 measurements, incl. 2 reagents, 2 glass vials with screw caps, syringe, dosing spoon, comparator block and colour scale. Reagent refill separately available