HI731321 Hanna — Replacement Glass Cuvettes 16 mm for Checker HC 2-Pack - Hanna

Hanna HI731321 replacement glass cuvettes for Checker HC — 16 mm, 2-pack

The Hanna HI731321 replacement glass cuvettes are the spare cuvettes for all Hanna Checker HC colorimeters (HI702, HI713, HI736, HI755, HI758, HI764, HI772, HI774, HI782, HI783, HI784). 16 mm diameter optical glass — swap a scratched, chipped or badly stained cuvette to preserve instrument accuracy, since any glass imperfection scatters the measurement LED beam.

Why replacing a scratched cuvette matters

• A scratch diffracts the LED beam — the reading is off without warning.
• A chipped cuvette changes the optical path length — invalid measurement.
• Deep stains from old reagent do not rinse away fully — permanent bias.
• A fresh cuvette costs less than a run of bad readings.

How to use

• Replace as soon as a scratch or chip is visible to the naked eye.
• Rinse each cuvette with RO water then with sample water before every measurement.
• Always hold the cuvette by the top — fingerprints on the optical path skew the reading.
• Store the spare cuvette in its original sachet to keep dust off.

Specifications

• Reference: HI731321 (formerly HI731315)
• Content: 2 glass cuvettes
• Diameter: 16 mm
• Material: optical glass
• Compatible with: all Hanna Checker HC (HI702, HI713, HI736, HI755, HI758, HI764, HI772, HI774, HI782, HI783, HI784)

Why get these cuvettes from ReefSolution

To keep your reef testing station accurate we also recommend:

• Hanna Checker HC HI772 dKH alkalinity — colorimeter that uses the HI731321 cuvettes.
• Hanna Checker HC HI758 marine calcium — same cuvette diameter.
• Hanna Checker HC HI783 marine magnesium — same cuvette diameter.
• Hanna HI98319 waterproof salinity tester — to complete the reef station.

Frequently asked questions

How long does a Hanna HI731321 cuvette last?

Depending on handling: 6 months to 2 years of regular reef testing. Replace immediately when scratched to avoid biased readings.

Are these cuvettes compatible with all Hanna Checker HC models?

Yes, the 16 mm diameter is standard across the Checker HC range (HI702 to HI784). One cuvette pack serves every Checker in the house.

How do I clean a Hanna cuvette without scratching it?

Rinse with RO water, shake off, air-dry or wipe with a non-abrasive microfiber cloth. Never use rough tissue or scrape reagent stains.