Aquarium Systems Test Kit A new range of test kits from Aquarium Systems that accurately test your pond/aquarium water. Use Seatest\'s NO2 (nitrite) test kit to monitor and adjust levels of nitrites in your aquarium water, thereby preventing nitrite build-up and excess algae growth. The kit contains sufficient reagent for up to 140 tests, and will provide accurate readings and peace of mind with your aquarium. Accuracy is 0.05mg/l Please note this product is short dated - BBE August 2015.