Hanna HI772 Alkalinity Checker
HI-ALK
The Hanna Instruments HI772 Marine Alkalinity Checker HC is a handheld digital colorimeter that measures saltwater alkalinity in dKH using a fixed-wavelength LED and silicon photodetector for accurate, repeatable results....
Or build it into a bundle — save up to 6% ↓What it is, and who it is for.
The Hanna Instruments HI772 Marine Alkalinity Checker HC is a handheld digital colorimeter that measures saltwater alkalinity in dKH using a fixed-wavelength LED and silicon photodetector for accurate, repeatable results. It reads from 0.0 to 20.0 dKH with +/-0.3 dKH accuracy via simple one-button operation, offering a more reliable alternative to color-card test kits. It ships with sample cuvettes, a starter reagent kit, syringe and battery.
Build around the Hanna HI772 Alkalinity Checker.
It's already in your system below. Add the flow, filtration and dosing around it and the discount starts working — tiers climb as the build grows, and the reef meter fills with it.
Pick the right one, not the biggest one
The honest line-up from test kits. Most buyers reading this page should buy the middle column.
Red Sea Reef Foundation Pro Test Kit
Hanna HI772 Alkalinity CheckerAsked before checkout
The questions our support inbox actually gets.
Does it ship quickly?+
Orders placed before 2 PM ET on a business day leave the same day. Tracking is emailed the moment the label prints.
What if it's the wrong fit for my tank?+
Return it. 30 days, no restocking fee, refund to the original payment method. Better: tell us your tank first and we'll spec the system for free — half of all returns are sizing problems.
Who handles the warranty?+
We do. Everything carries the manufacturer's warranty and we run the claim for you — one email to us instead of a ticket queue.
How does the bundle discount work?+
Add items in the bundle builder: 2+ items saves 5%, 3+ saves 8%, 4+ saves 12%, and 5+ saves 15% off the whole system, applied at checkout.