Product Description
Professional Saltwater Alkalinity Colorimeter for Reef & Marine AquariumsThe Hanna HI755 Checker HC is a portable, professional-grade saltwater alkalinity colorimeter designed for accurate alkalinity measurement from 0 to 300 ppm (mg/L) CaCO₃ in reef aquariums, marine tanks, and saltwater aquaculture. This handheld photometer delivers lab-quality results with simple operation—just add reagent, insert the cuvette, and read alkalinity on the easy-to-read LCD display. Essential for maintaining optimal coral health and reef tank stability.Key Features:
Marine Alkalinity Testing: Measures alkalinity from 0 to 300 ppm (mg/L) CaCO₃ with ±5 ppm accuracy—ideal for reef tanks, SPS/LPS coral systems, and saltwater aquariums
Portable & Handheld: Compact Checker HC design fits in your pocket for testing anywhere—perfect for aquarium maintenance and water changes
Lab-Quality Results: Advanced photometric technology delivers accurate, repeatable measurements comparable to expensive benchtop instruments
Simple Operation: Easy three-step process—fill cuvette, add reagent, read result—no complex titrations or color matching
LCD Display: Large, easy-to-read screen shows alkalinity in ppm (mg/L) CaCO₃
Auto-Off Function: Conserves battery life with automatic shutdown after 10 minutes of non-use
CAL Check: Built-in validation feature verifies meter performance for quality assurance
Complete Kit: Includes meter, sample cuvettes, reagents for initial testing, and rigid carrying case
Technical Specifications:
Model: HI755
Parameter: Alkalinity (as CaCO₃)
Range: 0 to 300 ppm (mg/L)
Resolution: 1 ppm
Accuracy: ±5 ppm ±5% of reading @ 25°C
Method: Colorimetric method
Light Source: LED @ 466 nm
Light Detector: Silicon photocell
Battery: 1 x 1.5V AAA (included)
Auto-Off: After 10 minutes of non-use
Dimensions: 81.5 x 61 x 37.5 mm (3.2 x 2.4 x 1.5 inches)
Weight: 1 lb
Country of Origin: Romania
SKU: HI755
Barcode: 765105746207
Applications:Essential for reef aquarium alkalinity monitoring (SPS coral, LPS coral, soft coral tanks), marine aquarium water quality management, saltwater aquaculture, coral propagation systems, reef tank maintenance, water change verification, and any saltwater application requiring precise alkalinity measurement. Perfect for reef hobbyists maintaining optimal coral growth conditions, marine aquarium professionals, and coral farmers.What's Included:
HI755 Alkalinity Checker HC
Sample cuvettes with caps (2)
Alkalinity reagents for initial testing
1.5V AAA battery
Instruction manual
Instrument quality certificate
Rigid carrying case
Why Test Alkalinity in Reef Tanks?Alkalinity (carbonate hardness/KH) is one of the most critical parameters in reef aquariums. It provides the buffering capacity that stabilizes pH and supplies carbonate ions essential for coral skeleton formation and calcification. Optimal alkalinity levels (typically 7-11 dKH or 125-200 ppm) ensure healthy coral growth, vibrant colors, and stable water chemistry. Low alkalinity causes pH swings and stunted coral growth, while high alkalinity can lead to precipitation and tissue damage. The HI755's 0-300 ppm range covers the full spectrum of reef tank alkalinity levels for precise monitoring.How to Use:
Fill cuvette with 10 mL saltwater sample to line
Add HI755 reagent packet and mix thoroughly
Wait for color development (1 minute)
Insert cuvette into HI755 Checker HC
Press button to read alkalinity in ppm (mg/L) CaCO₃
Convert to dKH if desired: dKH = ppm ÷ 17.9
Reagent Availability:Replacement reagents available separately as HI755-26 (25 tests). Each reagent packet is pre-measured for consistent, accurate results.Maintenance & Care:Rinse cuvettes with RO/DI water after each use to prevent salt buildup. Store in protective case when not in use. Replace battery when low battery indicator appears. Use CAL Check feature periodically to verify meter performance. Keep reagents stored in a cool, dry place away from moisture.Note: Reagents sold separately after initial supply is used. For best results, use fresh reagents and follow all testing procedures carefully. Regular CAL Check validation recommended for quality assurance. Results in ppm can be converted to dKH (degrees of carbonate hardness) by dividing by 17.9.
