HI783-25 Hanna Magnesium Reagents — 25 Tests for Checker HC HI783 - Hanna

Hanna HI783-25 magnesium reagents — 25 tests for the Hanna Checker HC HI783

The Hanna HI783-25 reagents are the dedicated reagents for the Checker HC HI783, a Hanna Instruments pocket colorimeter that measures magnesium in reef marine aquariums. Each box holds 25 individual tests, one per measurement. The formula is calibrated to the LED and the chemistry of the Checker HC HI783 — using a reagent from a different model gives wrong and meaningless readings.

In practical use, this reagent pack lets you hold reef magnesium between 1250 and 1350 ppm on an SPS or LPS tank.

What these reagents bring

• Beer-lambert colorimetric method — the same chemistry used in the lab and calibrated to the Checker HC HI783 LED.
• 25 tests per box — enough for 2 to 6 months of monitoring depending on frequency.
• Genuine Hanna formulation, made in the same conditions used at the factory to calibrate the colorimeter.
• Pre-measured sachets — no scale or pipette needed.
• Reproducible readings when procedure is followed (rinsing, timing, agitation).

Measurement procedure

• Rinse the cuvette with RO water, then with sample water.
• Fill to the mark, insert the cuvette and press Zero.
• Add the contents of one HI783-25 sachet and agitate for the time specified in the Hanna datasheet.
• Reinsert the cuvette and press Read — the reading appears on the digital display.
• Rinse the cuvette immediately with distilled water to prevent residue.

Specifications

• Hanna reference: HI783-25
• Number of tests: 25
• Compatible with: for the Hanna Checker HC HI783
• Parameter measured: magnesium
• Range: 1000 to 1800 ppm
• Method: Beer-Lambert colorimetric method
• Storage: dry, room temperature, out of direct sunlight.

Why get these reagents from ReefSolution

• Hanna Checker HC HI783 — the matched colorimeter for these reagents; always use fresh reagents to preserve instrument accuracy.
• Hanna Checker HC HI772 dKH alkalinity — the reef parameter that shifts fastest; measure twice a week on an SPS tank.
• Hanna Checker HC HI758 marine calcium — completes the reef Ca/KH/Mg trinity.
• Hanna Checker HC HI783 marine magnesium — measure every 2-4 weeks.
• Hanna HI98319 waterproof salinity tester — salinity in ppt/PSU/SG with temperature compensation.

Frequently asked questions

How many tests are in a box of Hanna HI783-25 reagents?

25 individual tests — one reading per Hanna Checker HC HI783 measurement. That typically covers 2 to 6 months of tank monitoring.

Can I use Hanna HI783-25 reagents with a different Checker model?

No. Each reagent reference is calibrated to the LED and chemistry of its matched Checker HC. Using another model's reagent produces wrong readings.

How should Hanna reagents be stored to preserve accuracy?

Store dry, at room temperature, out of direct sunlight. Do not open the sachets in advance — the chemistry degrades on contact with humidity.