These are replacement reagents for the Hanna HI781 Marine Nitrate Low Range Checker HC, the handheld colorimeter used to test nitrate in marine aquarium water. Each pack contains enough reagent for 25 tests (code HI781-25).
The reagents come pre-made, so there's no measuring or mixing of your own chemicals before a test. They're prepared with high-purity chemicals and work with the colorimetric method, where the checker reads the colour change in your water sample. The reagents are marked with their lot number and expiration date, so you can trace what you're using and know when it's due to be replaced.
They suit reef keepers and marine hobbyists who already own the HI781 checker and want to keep monitoring nitrate on a regular basis. Note that they're made specifically for the HI781 Low Range Checker HC and are not intended as a standalone test kit.
Specs: 25 tests, colorimetric method, code HI781-25.
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