Simple, accurate, and cost-effective digital pH testing for swimming pools, hot tubs, and spas. The Hanna HI779 Checker HC is a handheld colorimeter that delivers laboratory-quality pH measurements with ±0.2 pH accuracy, providing a more reliable alternative to traditional chemical test kits and color-matching strips.
Key Features & Benefits
-
Superior accuracy – ±0.2 pH precision eliminates guesswork from color-matching test kits
-
Digital colorimetric method – LED light source at 525 nm with silicon photocell detector
-
Pool-optimized range – Measures 6.3 to 8.6 pH, ideal for swimming pool and spa applications
-
Simple operation – Add reagent, insert cuvette, press button for instant digital results
-
Cost-effective – Affordable alternative to expensive pH meters with comparable accuracy
-
Complete starter kit – Includes reagents, cuvettes, and battery for immediate testing
-
Portable design – Compact, lightweight handheld unit perfect for poolside testing
-
Auto-off function – Automatically shuts off after 10 minutes to conserve battery life
Why Choose the HI779 Checker HC?
Traditional chemical test kits rely on subjective color matching, which can lead to inaccurate readings due to lighting conditions, color perception differences, and reagent degradation. The HI779 Checker HC eliminates these variables with objective digital colorimetric measurement, giving you consistent, reliable pH readings every time you test your pool or spa water.
How It Works
The HI779 uses the colorimetric adaptation of the Phenol Red method, a proven technique for pH measurement in pool water. Simply add the reagent to your water sample in the provided cuvette, insert it into the meter, and press the button. The built-in LED light source illuminates the sample at 525 nm, and the silicon photocell detector measures the color intensity to calculate an accurate pH reading displayed digitally on the LCD screen.
Perfect for Pool & Spa Maintenance
Accurate pH Control
Maintaining proper pH levels (7.2-7.8) is critical for swimmer comfort, sanitizer effectiveness, and equipment longevity. The HI779 gives you the accuracy you need to make informed chemical adjustments and keep your pool water perfectly balanced.
Better Than Test Strips
Unlike test strips that fade, expire quickly, and require subjective interpretation, the HI779 provides objective digital readings that remove human error from the equation. No more squinting at color charts in varying light conditions.
More Affordable Than pH Meters
While traditional pH meters offer excellent accuracy, they require regular calibration, electrode maintenance, and storage solution. The HI779 delivers comparable accuracy for pool applications without the complexity or ongoing maintenance costs.
Easy to Use
-
Collect sample: Fill the cuvette with pool or spa water to the line
-
Add reagent: Add one packet of HI779 reagent and mix
-
Insert & measure: Place cuvette in the meter and press the button
-
Read result: Digital pH reading appears on the LCD display in seconds
Applications
- Residential swimming pools
- Commercial pools and aquatic facilities
- Hot tubs and spas
- Splash pads and water features
- Pool service and maintenance professionals
- Property management and HOA pool maintenance
Technical Specifications
| Specification |
Detail |
| SKU |
HI779 |
| pH Range |
6.3 to 8.6 pH |
| Resolution |
0.1 pH |
| Accuracy |
±0.2 pH @ 25°C (77°F) |
| Light Source |
Light Emitting Diode @ 525 nm |
| Light Detector |
Silicon photocell |
| Method |
Colorimetric Adaptation of Phenol Red Method |
| Environment |
0 to 50°C (32 to 122°F); max. 95% RH non-condensing |
| Battery Type |
1.5V AAA Alkaline |
| Auto-off |
After 10 minutes of non-use |
| Dimensions |
86.0 × 61.0 × 37.5 mm (3.4 × 2.4 × 1.5") |
| Weight |
64 g (2.3 oz) |
What's Included
The HI779 Checker HC arrives ready to test with everything you need:
- HI779 Checker HC colorimeter
- Sample cuvettes with caps (2 pcs.)
- Swimming pool pH reagent starter kit
- 1.5V AAA alkaline battery
- Instruction manual
Replacement Reagents & Accessories
-
HI779-25: Reagent set for approximately 100 swimming pool pH tests
-
HI779-11: Swimming pool pH certified standard calibration kit
Testing Tips for Best Results
-
Sample collection: Collect water sample at elbow depth, away from return jets and skimmers
-
Clean cuvettes: Rinse cuvettes with sample water before filling to avoid contamination
-
Mix thoroughly: Ensure reagent is completely dissolved before measurement
-
Avoid bubbles: Tap cuvette gently to remove air bubbles before inserting
-
Wipe exterior: Wipe outside of cuvette with clean, lint-free cloth before inserting
-
Test regularly: Test pH at least 2-3 times per week during swimming season
-
Store properly: Keep reagents in a cool, dry place away from direct sunlight
Understanding Pool pH
Ideal Range: 7.2 - 7.8 pH
pH Too Low (< 7.2): Acidic water can cause eye/skin irritation, corrosion of metal equipment, etching of plaster, and reduced chlorine effectiveness.
pH Too High (> 7.8): Alkaline water can cause cloudy water, scale formation, reduced sanitizer efficiency, and eye/skin irritation.
The HI779 helps you maintain optimal pH levels for safe, comfortable, and crystal-clear pool water.
Why Hanna Instruments?
Hanna Instruments is a global leader in analytical instrumentation with over 40 years of experience. The Checker HC line represents Hanna's commitment to making professional-grade testing accessible and affordable for pool owners and service professionals. Trusted by professionals in over 140 countries, Hanna delivers accuracy you can count on.
Warranty & Support
The HI779 Checker HC is backed by Hanna's quality guarantee and customer support. For technical assistance, calibration questions, or reagent information, contact our expert support team.
