The Fluval Calcium Test Kit for Aquarium Water, Freshwater & Saltwater Fish Tank Test is an ideal way to monitor calcium levels in your aquarium. This test kit comes with everything you need to get started, including a USB drive, a sample cup, and a detailed instruction manual. The instructions are easy to follow, and the results are quick and easy to read. With this test kit, you’ll be able to keep track of your calcium levels and make sure they’re staying within target ranges.