Hanna Instruments Marine Master Waterproof Wireless Multiparameter Photometer – HI97115UC
$ 96.24
The most accurate tester I own and is more consistant than more expensive monitors I own. I use this to make sure everything is on point with my testing and I have multiple systems without expensive monitors I use this on as well. I wish I bought this when I first started reefing over a decade ago, it is a game changer. As easy to use if not easier than the Checkers.
API PH TEST KIT 250-Test Freshwater Aquarium Water pH Test Kit, 4 Piece Set
Seachem Stability – For Freshwater and Marine Aquariums 250ml
API Phosphate and GH & KH Test Kits for Freshwater Aquariums, 64 Ounces Phosphate and 2.5 oz GH & KH
11 in 1 Aquarium Test Kit – Fish Tank Water Testing Kits with Ammonia Test Strips for Freshwater and Saltwater & eBook | Includes 50 Ammonia Strips, Thermometer, & Test Kit for Ponds & All Fish Tanks
