Neptune Trident NP - Marine Aquarium Water Analyzer - Nitrate & PhosphateTrident NP (Reagents sold separately) The best selling automated tester ever released has been modified to now test Nitrates and Phosphates with a level of precision, accuracy and ease of use not seen before Perfect for managing and understanding nutrients to Manage Feeding Plan Tank maintenance i. e. filter sock changes, media replacement, water changes Nutrient management through the of additives and reduceres paired with a DOS or DOSQD Low Nutrient