Hanna Alkalinity (dKH) Checker The Hanna Alkalinity (dKH) Checker HI772 is a marine handheld colorimeter designed to measure alkalinity directly in degrees of carbonate hardness. It gives reef and saltwater aquarium keepers a digital dKH result, making alkalinity testing easier to read and repeat than traditional colour-comparison kits. HI772 Marine Alkalinity Testing Alkalinity is one of the most important stability parameters in reef aquariums because it supports coral calcification and helps buffer pH. The HI772 measures from 0.0 to 20.0 dKH, covering the practical range needed for most marine and reef aquarium maintenance. Marine dKH Checker Features Measures saltwater alkalinity directly in dKH. Digital readout removes the difficulty of judging subtle colour changes. 0.1 dKH resolution helps track aquarium stability and dosing adjustments. Designed specifically for saltwater aquarium alkalinity testing. Simple one-button operation supports quick routine testing. Compact handheld format stores easily with reef testing supplies. Uses the colorimetric method with a yellow to green to blue reaction range. Works with Hanna HI772-26 replacement reagents. Hanna HI772 Specifications Part Number: HI772 Product type: marine alkalinity dKH handheld colorimeter checker Range: 0.0 to 20.0 dKH Resolution: 0.1 dKH Accuracy at 25°C / 77°F: ±0.3 dKH ±5% of reading Light source: LED at 610 nm Light detector: silicon photocell Method: colorimetric method Battery type: 1 x 1.5V AAA battery Auto shut-off: after ten minutes of non-use Operating environment: 0 to 50°C / 32 to 122°F with maximum 95% RH non-condensing Dimensions: 86.0 x 61.0 x 37.5 mm / 3.4 x 2.4 x 1.5 in Weight: 64 g / 2.3 oz Replacement reagent set: HI772-26 Calibration check set: HI772-11 Warranty: 1 year manufacturer warranty Marine Alkalinity Testing Notes Alkalinity can change quickly in reef aquariums with growing coral, coralline algae, kalkwasser, two-part dosing, or calcium reactor use. Test consistently, keep cuvettes clean, and use the same testing routine each time for reliable trend tracking. Using the Hanna dKH Checker Fill the cuvette with the saltwater sample, zero the checker, add the alkalinity reagent as directed, mix carefully, and read the dKH result on the display. Replace reagents with Hanna HI772-26 when the starter supply is used up. What's Included HI772 Marine Alkalinity dKH Checker HC 2 sample cuvettes with caps Alkalinity reagent starter kit for 25 tests Syringe with tip 1.5V AAA battery Instructions Quick start guide
