These are the replacement reagents for the Hanna HI783 Marine Magnesium Checker HC handheld colorimeter. Each pack covers 25 tests, so you can keep tracking magnesium in your reef tank without having to mix anything yourself.
The reagents come pre-made, which keeps testing simple. They are prepared from high-purity chemicals, and every packet is printed with its lot number and expiration date, so you can see exactly what you're using and when it should be replaced.
They suit reef keepers who already own the HI783 Checker and want to keep up regular magnesium checks, whether that's a small display tank or a larger system where calcium and alkalinity stability depend on magnesium staying in range. Please note they are made for use with the HI783 Checker HC only.
Size: 25 tests. Product code: HI783-25.
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