Hanna Instruments Saltwater Aquarium Alkalinity Colorimeter (dKH) Checker® HC (HI772)

The Hanna Instruments Saltwater Aquarium Alkalinity Colorimeter (dKH) Checker HC (HI772) is a digital alkalinity tester specifically designed for marine aquariums. Its main function is to provide accurate measurements of alkalinity in degrees of carbonate hardness (dKH), a critical parameter for pH stability and overall reef system health.

Unlike traditional test kits that rely on subjective color matching, this colorimeter delivers clear, digital readings, greatly reducing the chances of human error. This precision is especially important in reef tanks, where even small fluctuations in water chemistry can affect the health and growth of corals, particularly SPS and LPS species.

Using the Checker is simple. Fill the cuvette with 10 ml of aquarium water, insert it into the device to calibrate, remove it and add the reagent, gently shake to mix, then reinsert the cuvette. In just a few seconds, the Checker displays the alkalinity level in dKH on its digital screen.

Owning this device is highly recommended for both beginners and experienced reef keepers. It allows for consistent and accurate monitoring of a key water parameter, helping to prevent sudden changes that could harm livestock. With its compact size, ease of use, and reliable performance, the HI772 Checker is an essential tool for maintaining optimal conditions in saltwater aquariums.