These are replacement reagents for the Hanna Marine pH Checker HC (HI780), supplied as a pack of 25 tests under code HI780-25. They're what you need to keep testing the pH of your saltwater tank once the reagents that came with your checker run out.
Each reagent is pre-measured, so there's no dosing or mixing to get right. You simply use one with your checker and read the result. That keeps testing quick and consistent from one session to the next, whether you're new to the hobby or have been keeping reefs for years.
The reagents are made from high-purity chemicals to support repeatable pH readings with the HI780 checker. Every packet is printed with a lot number and an expiration date, so you can trace what you're using and know when it's time to replace it.
These suit anyone who already owns the HI780 Marine pH Checker HC and wants a ready supply for regular tank monitoring. They are not intended for use with other checkers.
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