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Keep reef magnesium checks matched to marine chemistry.
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HI83399 §9.50 Marine Magnesium: 1000–1800 mg/L as Mg²⁺; 640 nm method. Reagents sold separately.
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Replenish your HI783 Checker or the documented HI83399 marine magnesium method without replacing the meter. This 25-test refill is designed for magnesium concentrations typical of saltwater aquarium monitoring, with a direct magnesium-ion result rather than a hardness value.
Choose this refill for marine magnesium at 1000–1800: ppm as Mg²⁺ on HI783, or mg/L as Mg²⁺ on the HI83399 Marine Magnesium method. It is not freshwater magnesium chemistry from the HI93752 family or HI93719 magnesium-hardness reagent.
HI783A-0 Marine Magnesium Reagent A and HI783IND-0 indicator provide the matched chemistry for 25 tests. Replenish your existing setup for repeat marine magnesium checks; repeats and quality-control tests also use reagent capacity.
Accurate dosing depends on separate, clean and dry 5 mL syringes with their matching tips: black printing for reagent A and blue printing for the marine sample. Keep each syringe dedicated to its role; the linked instrument manuals provide the full dosing and reading procedure.
For the documented HI783 Checker and HI83399 Marine Magnesium methods, keep the prepared cuvette (sample plus reagents) at 22–28 °C and hold it by the cap to avoid warming the glass. Calcium below 300 or above 500 mg/L can interfere, so check sample composition before choosing this method for an unusual marine matrix.
HI783 Checker specifies 1000–1800 ppm as Mg²⁺ with 5 ppm resolution and a 610 nm LED. The documented HI83399 Marine Magnesium method specifies 1000–1800 mg/L as Mg²⁺ with 5 mg/L resolution and 640 nm optics. Use each instrument’s own method and specifications—not a generic magnesium or hardness program.
Have the compatible instrument, clean cuvette and cap, dedicated syringes and tips, scissors, lint-free cleaning materials and RODI water for rinsing ready separately. RODI rinsing and keeping reagent and sample tips separate help avoid contamination; do not rinse with tank water. This reagent refill is not an instrument starter kit.
Wear the protective equipment specified in the component SDS, avoid contact with reagents and dispose of used solutions according to the SDS and local requirements. Check the supplied lot label and component SDS before use.
Choose it to replenish an HI783 Marine Magnesium Checker or the directly documented HI83399 Marine Magnesium method when your marine sample is within 1000–1800 on the instrument’s stated magnesium-ion scale.
No. HI783 reports ppm as Mg²⁺ and HI83399 reports mg/L as Mg²⁺. This is not a magnesium-hardness result as CaCO₃ and should not be relabeled as one.
No substitution is established. The HI93752 family’s freshwater magnesium method and HI93719 magnesium-hardness method answer different measurement questions. Use this set only with its documented marine method.
The marine procedure requires the sample-plus-reagent cuvette to be 22–28 °C. Warm or cool the prepared cuvette as needed and hold it by the cap; warming the glass with your hands can affect accuracy.
Yes. Calcium below 300 or above 500 mg/L is a listed interference. Check your sample and the complete method guidance rather than assuming all saltwater compositions are suitable.
No. The HI783 uses 610 nm, while HI83399 §9.50 specifies 640 nm. Compatibility is established by their named methods and exact reagent listing, not by treating one wavelength as universal.
Have a compatible meter, clean dry cuvette and cap, two dedicated 5 mL syringes with their correct tips, scissors and cleaning materials ready separately. Keep the black-print reagent syringe separate from the blue-print sample syringe, and use RODI water for rinsing.
Hanna states capacity for 25 tests; repeats and quality-control checks consume that capacity too. This is a test-capacity rating, not a count of bottles or packets. The factory photograph shows representative packaging; use the supplied lot label for expiry information.
At Blue Tiger Scientific, we are proud to distribute authentic Hanna Instruments products. The following policies apply to all purchases made through our store.
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