Alkalinity Checker - Colorimeter - Hanna Instruments

Alkalinity is one of the most consequential parameters in a reef system. It fuels coral calcification, buffers pH swings, and interacts directly with calcium and magnesium levels — which means the accuracy of your test matters as much as the frequency. Standard drop-count or tablet kits require you to judge endpoint color changes by eye, introducing variability that compounds over time. The Hanna HI772 Checker HC removes that variable by measuring sample absorbance with a dedicated optical sensor and reporting a direct digital readout in dkH or CaCO3.

The HI772 uses a single-reagent colorimetric method and a purpose-built optical path calibrated specifically for the alkalinity parameter. Because the device is dedicated to one measurement — not a multi-parameter unit trying to cover everything — the calibration stays relevant and the result is consistent from test to test. The one-button interface walks you through the blank and sample steps, so there is no menu navigation or mode switching required.

At roughly pocket size, the HI772 is practical at the tank, at a frag tank, or when traveling to a client's system. The included cuvettes, syringe, and carrying case keep everything organized and protected between uses. Reagent packets are consumed per test, so ongoing cost is predictable — and significantly less than the recurring expense of a full reagent-based auto-doser monitor.

The HI772 is appropriate for marine hobbyists, frag grow-out operations, aquaculture facilities, and anyone who needs a step up in precision over a color-chart kit without the footprint or cost of laboratory instrumentation. Factor in a fresh set of reagent pouches and proper rinsing of the cuvette between readings to maintain the accuracy the unit is capable of delivering.