Hanna Instruments HI781 / 781 – Marine Nitrate Low Range Colorimeter – Checker® HC

Hanna Instruments HI781 – Marine Nitrate Low Range Colorimeter – Checker® HC 🌊🧪

Accurately test ultra-low nitrate levels with the Hanna Instruments HI781 Marine Nitrate LR Checker® HC. Also known as the Hanna 781, this handheld digital colorimeter helps reef aquarists maintain stable, nutrient-controlled environments for sensitive SPS corals. 🪸🔬

🌿 Designed for Reef Stability

Low-range nitrate testing is crucial for coral health. The HI781 provides precise readings from 0.00 to 5.00 ppm, allowing you to fine-tune nutrient export and feeding in SPS-dominated systems.

🖐️ Digital Accuracy Made Simple

Say goodbye to difficult color charts. With the HI781, add reagent, place the cuvette, and press a button for a fast, accurate digital readout.

🔗 Pairs with HI781-25 Reagents

Works with HI781-25 reagent refills (sold separately), each providing 25 tests per pack.

🔑 Key Features

• Measures nitrate in saltwater from 0.00 to 5.00 ppm
• ±0.25 ppm ±2% of reading accuracy
• Resolution: 0.01 ppm
• Colorimetric method with clear digital display
• Portable, reef-safe design
• One-button operation

📦 What’s Included

• HI781 Checker® HC Colorimeter
• Two sample cuvettes with caps
• Starter reagent packets (6 tests – HI781-25)
• 1.5V AAA battery
• Instruction manual

Maintain ultra-low nutrient conditions with the Hanna HI781 Marine Nitrate LR Checker® HC—trusted by reef keepers for SPS coral success. 🐠🧪

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