Product Description
Professional Freshwater Magnesium Hardness Colorimeter for Aquariums & AquacultureThe Hanna HI719 Checker HC is a portable, professional-grade freshwater magnesium hardness colorimeter designed for accurate magnesium (Mg) measurement from 0.00 to 2.00 mg/L in freshwater aquariums, aquaculture, and water quality applications. This handheld photometer delivers lab-quality results in the field with simple operation—just add reagent, insert the cuvette, and read magnesium hardness on the easy-to-read LCD display.Key Features:
Freshwater Magnesium Testing: Measures magnesium hardness from 0.00 to 2.00 mg/L (ppm) with ±0.11 mg/L accuracy—ideal for freshwater aquariums and aquaculture
Portable & Handheld: Compact Checker HC design fits in your pocket for on-site testing anywhere
Lab-Quality Results: Advanced photometric technology delivers accurate, repeatable measurements comparable to benchtop instruments
Simple Operation: Easy three-step process—fill cuvette, add reagent, read result—no complex procedures
LCD Display: Large, easy-to-read screen shows magnesium concentration in mg/L (ppm)
Auto-Off Function: Conserves battery life with automatic shutdown after 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 carrying case
Technical Specifications:
Model: HI719
Parameter: Magnesium Hardness (Mg)
Range: 0.00 to 2.00 mg/L (ppm)
Resolution: 0.01 mg/L
Accuracy: ±0.11 mg/L ±5% of reading @ 25°C
Method: Adaptation of Calmagite 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: HI719
Applications:Essential for freshwater aquarium magnesium monitoring (planted tanks, cichlid tanks, community aquariums), aquaculture water quality management (fish farms, hatcheries), freshwater shrimp breeding, environmental freshwater testing, laboratory analysis, and any application requiring accurate low-range magnesium measurement in freshwater systems. Perfect for aquarium hobbyists maintaining optimal water chemistry, aquaculture professionals, and environmental consultants.What's Included:
HI719 Magnesium Hardness Checker HC
Sample cuvettes with caps (2)
Magnesium Hardness reagents for initial testing
1.5V AAA battery
Instruction manual
Instrument quality certificate
Rigid carrying case
Why Test Magnesium Hardness?Magnesium is a critical element in freshwater aquariums and aquaculture. In planted aquariums, magnesium is essential for photosynthesis and chlorophyll production—deficiency causes yellowing leaves and poor plant growth. For fish, magnesium contributes to general hardness (GH) and affects osmoregulation, bone development, and overall health. In cichlid tanks, proper magnesium levels help maintain ideal water hardness. The HI719's low range (0-2 mg/L) is perfectly suited for freshwater applications where precise magnesium monitoring ensures optimal conditions for fish and plants.How to Use:
Fill cuvette with 10 mL freshwater sample to line
Add HI719 reagent packet and mix thoroughly
Wait for color development (1 minute)
Insert cuvette into HI719 Checker HC
Press button to read magnesium hardness in mg/L
Reagent Availability:Replacement reagents available separately as HI719-25 (25 tests) and HI719-100 (100 tests). Each reagent packet is pre-measured for consistent, accurate results.Maintenance & Care:Clean cuvettes with distilled water after each use. 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.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.
