Hanna Instruments Marine Phosphate Ultra Low Range Colorimeter - Checker® HC (HI774)

HI774 Marine Phosphate Ultra Low Range Colorimeter - Checker® HC by Hanna Instruments is a highly precise digital colorimeter specifically designed for measuring ultra-low levels of phosphate in saltwater aquariums. This advanced tool replaces traditional visual test kits by providing a simple, accurate, and reliable digital reading in parts per billion (ppb), making it ideal for reef keepers who demand tight control over nutrient levels.

Phosphate is a critical nutrient in marine systems. Even in extremely low concentrations, it can contribute to algae outbreaks, hinder coral growth, and disrupt the delicate chemical balance of reef tanks. Maintaining phosphate levels at or below 0.05 ppm (50 ppb) is often necessary to support the health of SPS and LPS corals and prevent unwanted algae growth. The HI774 allows aquarists to detect and track these minute concentrations with confidence.

Using the HI774 Marine Phosphate Checker® HC is straightforward. First, fill the provided cuvette with 10 ml of saltwater from the aquarium. Insert it into the Checker to zero the device. Then, remove the cuvette, add the reagent powder from a pre-measured packet, shake gently to mix, and reinsert the cuvette. In less than a minute, the phosphate concentration is displayed on the digital screen in ppb, with a high degree of accuracy and repeatability.

This Checker is an essential tool for reef aquarists who follow ultra-low nutrient systems (ULNS), use phosphate removers, or dose specific additives that impact phosphate levels. Unlike traditional color comparison kits, which can be difficult to read and prone to error, this digital colorimeter delivers clear and objective results every time.

With Hanna Instruments HI774, users gain greater control over their reef environment. Its compact size, ease of use, and laboratory-level precision make it a trusted choice for both hobbyists and professionals who require exact phosphate monitoring. Regular use helps ensure optimal coral health, enhanced coloration, and long-term aquarium stability.