Hanna Marine Alkalinity (dKH) Checker HC

HI772 Handheld Colorimeter for Marine & Reef Aquariums

The Hanna Marine Alkalinity (dKH) Checker is a compact, digital colorimeter designed to deliver laboratory-grade accuracy at a price comparable to traditional chemical test kits. It eliminates subjective color matching by using a fixed-wavelength LED and silicon photodetector, providing consistent and repeatable alkalinity readings in dKH.

Alkalinity is critical in marine systems, supporting coral skeletal growth and acting as a buffer against dangerous pH swings. The HI772 offers reef keepers and aquaculture professionals a fast, reliable way to monitor this essential parameter with confidence.

Key Features

• Measures alkalinity directly in dKH

• Greater accuracy and resolution than liquid test kits

• Fixed-wavelength LED with silicon photodetector

• Compact, lightweight, and portable design

• Built-in timer for precise test consistency

• One-button operation for ease of use

• Dedicated single-parameter checker for maximum accuracy

Why Choose the Hanna dKH Checker?

Unlike traditional test kits that rely on visual color comparison, the HI772 uses optical measurement technology to determine alkalinity through absorbance. This removes user interpretation errors and delivers professional-level precision without the high cost of full laboratory instruments.

Its pocket-sized design makes it ideal for routine testing at home, in fish rooms, retail environments, or aquaculture facilities.

Simple 4-Step Testing

1. Fill the cuvette with sample water

2. Zero the checker

3. Add reagent

4. Press the button and read results in dKH

Fast, repeatable, and reliable—every time.

Ideal For

• Reef aquariums

• Marine aquariums

• Aquaculture systems

• Water quality monitoring

• Serious hobbyists and professionals

What’s Included

• Hanna HI772 Marine Alkalinity Checker

• Sample cuvette(s)

• Starter reagent set

• Battery

• Instructions