HI781-25 Hanna Nitrate Low Range Reagents — 25 Tests for Checker HC HI781 - Hanna

Hanna HI781-25 nitrate low range reagents — 25 tests for Checker HC HI781

The Hanna HI781-25 reagents are the dedicated reagents for the Hanna Checker HC HI781 Marine Nitrate Low Range colorimeter, built to measure nitrate accurately on ULNS reef tanks where NO₃ stays below 5 ppm. Each box has 25 tests. The chemistry is zinc reduction, calibrated for the low-range sensitivity of the HI781.

What these reagents bring

• 25 tests calibrated to the HI781 LED and chemistry.
• Zinc reduction chemistry — the same used on the HI782 (high range) but dosed for low-range sensitivity.
• Pre-measured sachets — no scale or pipette.
• Genuine Hanna formulation, reproducible test to test.

How to use

• Rinse the cuvette with RO water and sample water.
• Fill to the mark, insert the cuvette, press Zero.
• Add one HI781-25 sachet and agitate as per the Hanna datasheet.
• Reinsert and press Read.

Specifications

• Reference: HI781-25
• Number of tests: 25
• Compatible with: Hanna Checker HC HI781 Marine Nitrate Low Range
• Method: zinc reduction
• Storage: dry, at room temperature, out of direct sunlight.

Why get these reagents from ReefSolution

• The Hanna Checker HC HI781 colorimeter is not currently stocked — contact us for a special order.
• Hanna HI782-25 — nitrate high range reagents — the HR version (0-75 ppm) if nitrate goes above the LR range.
• Hanna Checker HC HI772 dKH alkalinity — to complete the reef station.
• Hanna Checker HC HI774 phosphate ULR — the PO₄ counterpart on hungry SPS tanks.

Frequently asked questions

How many tests are in a box of Hanna HI781-25 reagents?

25 tests — one test per measurement on the Hanna Checker HC HI781.

Can I use HI781-25 reagents on the HI782 Checker?

No. Each reagent reference is calibrated to its matched Checker HC. HI782 uses its own HI782-25 reagents.

When should I use a Nitrate Low Range Checker instead of High Range?

The LR HI781 is meant for ULNS SPS reefs where NO₃ stays under 5 ppm; the HR HI782 (0-75 ppm) fits FOWLR or higher-nutrient reef tanks.