Best Reef Tank Test Kits (2026)
Once you know your numbers, run them through the Alkalinity & Calcium Dosing Calculator to get a dosing target.
Finn Sterling, Reef Systems Editor
·
Updated Aug 8, 2026
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Best Overall
Hanna Instruments HI772 Marine Alkalinity Checker HC
Digital colorimeter · 0-20.0 dKH range, ±0.3 dKH ±5% accuracy, ~25 tests/reagent bottle · 4.8/5 (148 reviews, Amazon) · $74.99-79.50
Pros
- Buyers who found manual titration "a pain to mess up" call it reliable and easy, per an Amazon verified review
- A colorblind buyer specifically called it "accurate and quick" where color-comparison kits are hard to read, per an Amazon verified review
Cons
- Manufacturer's own ±0.3 dKH ±5% tolerance means a 10.0 dKH reading could really be anywhere from 9.2 to 10.8 dKH, per Hanna's own spec sheet. Some reef keepers separately report unit-to-unit drift against titration, per a Reef2Reef thread
- Highest upfront cost of the three, plus ongoing reagent purchases
Salifert Calcium Test Kit
Titration · 50-100 tests per kit · 4.6/5 (660 reviews, Amazon) · $19.99-23.91
Pros
- Lowest cost per test of the three (roughly $0.20-0.48/test depending on which size kit you buy), and a buyer called the color-change endpoint easy to read accurately, per an Amazon verified review
Cons
- Titration takes more hands-on technique than a digital checker, and one buyer received a test vial cracked in shipping, a packaging issue rather than a chemistry one, per an Amazon verified review
API Reef Master Test Kit (Best All-in-One)
Liquid reagent · tests Calcium, Carbonate Hardness (KH), Phosphate, Nitrate · 4.6/5 (1,891 reviews, Amazon) · $35.98
Pros
- Four parameters in one box at the lowest cost per parameter here, with simple directions and easy-to-read colors, per an Amazon verified review
Cons
- The same Amazon verified review notes the nitrate and phosphate tests "give you a general range" rather than a precise number, and says to skip this kit if you need precision on those two parameters specifically
Pricing and ratings checked Aug 8, 2026 from manufacturer, specialty-retailer, and Amazon listings and fluctuate. Verify current price before buying.