Professional pH testing designed specifically for swimming pools, hot tubs, and spas. The Hanna HI981004 Pool Line Checker® Plus pH Tester delivers precise 0.01 pH resolution with ±0.2 pH accuracy, featuring a replaceable electrode, automatic calibration, and simple one-button operation—making pool water testing fast, accurate, and hassle-free.
Key Features & Benefits
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Pool-specific design – Engineered for swimming pool, hot tub, and spa water testing
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High precision – 0.01 pH resolution with ±0.2 pH accuracy for reliable water balance
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Replaceable electrode – HI1271 gel-filled electrode extends tester life indefinitely
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Automatic calibration – One or two-point auto calibration with buffer recognition
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Simple operation – Single button controls ON/OFF and calibration
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Temperature measurement – Displays both pH and temperature simultaneously
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Long battery life – Up to 1000 hours continuous use with CR2032 battery
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Complete kit – Includes electrode, buffers, cleaning solution, battery, and carrying case
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Large LCD display – Shows stability indicator, battery status, and calibration tags
Why pH Matters for Pool Water
Maintaining proper pH levels (7.2-7.8) is critical for swimmer comfort, sanitizer effectiveness, and equipment protection. The HI981004 gives you the precision needed to:
- Optimize chlorine effectiveness and reduce chemical costs
- Prevent eye and skin irritation for swimmer comfort
- Protect pool equipment from corrosion or scale buildup
- Maintain crystal-clear water appearance
- Meet health department standards for commercial pools
- Make informed chemical adjustments with confidence
Designed for Pool Professionals & Homeowners
Whether you're a pool service professional managing multiple accounts or a homeowner maintaining your backyard oasis, the HI981004 Pool Line tester delivers professional-grade accuracy at an affordable price. The replaceable electrode design means your investment is protected—when the electrode eventually wears out, simply replace it instead of buying a new tester.
Advanced Features for Confident Testing
Large LCD Display
The enhanced LCD displays multiple indicators simultaneously:
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pH reading: 0.01 resolution for precise measurements
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Temperature: Simultaneous temperature display
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Stability indicator: Confirms when reading is stable and ready to record
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Low-battery indicator: Alerts you when battery needs replacement
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Calibration tags: Shows which buffers were used for calibration
Replaceable HI1271 pH Electrode
The included HI1271 gel-filled pH electrode offers several advantages:
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Tapered design: Fits easily into containers with small openings
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Gel-filled: Maintenance-free, no refilling required
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Durable construction: Plastic body reduces maintenance needs
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Easy replacement: Simple screw-on/screw-off design when replacement is needed
Automatic Calibration
Calibrate automatically to one or two points with automatic buffer recognition. The tester recognizes standard buffers (pH 4.01, 7.01, and 10.01) and displays calibration tags showing which buffers were used, ensuring proper calibration every time.
User-Controlled Auto Shut-Off
Automatic shut-off with user-controlled settings conserves battery life if the meter is accidentally left on. Choose the setting that best fits your testing routine.
Exceptional Battery Life
The CR2032 Li-ion battery provides approximately 1000 hours of continuous use—one of the longest battery lives available. The low-battery indicator gives you advance warning when it's time to replace the battery.
Simple One-Button Operation
The HI981004 keeps things simple with a single button that controls both ON/OFF and calibration functions. This streamlined design makes testing quick and intuitive, even for first-time users.
Complete Kit - Ready for Poolside Testing
Your HI981004 Pool Line Checker® Plus arrives with everything needed for immediate pool testing:
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HI1271 pH electrode: Replaceable gel-filled electrode with tapered design
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pH 4.01 buffer sachets (2): For calibration
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pH 7.01 buffer sachets (2): For calibration
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Electrode cleaning solution sachets (2): Keeps electrode in optimal condition
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CR2032 Li-ion battery: Pre-installed for immediate use
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Carrying case: Protects tester and accessories
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Quality certificate: Hanna quality assurance documentation
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Instruction manual: Complete operating instructions
Applications
- Residential swimming pools
- Commercial pools and aquatic centers
- Hot tubs and spas
- Splash pads and water features
- Pool service and maintenance companies
- Property management and HOA pools
- Hotel and resort pool maintenance
- Municipal pool facilities
Technical Specifications
| Specification |
Detail |
| SKU |
HI981004 |
| pH Range |
0.00 to 14.00 pH |
| pH Resolution |
0.01 pH |
| pH Accuracy (@25°C/77°F) |
±0.2 pH |
| pH Calibration |
Automatic, one or two-point with buffer recognition |
| pH Electrode |
HI1271 replaceable gel-filled electrode (included) |
| Temperature Display |
Yes (simultaneous with pH) |
| Battery Type / Life |
CR2032 Li-ion / Approximately 1000 hours continuous use |
| Auto Shut-Off |
User-controlled settings |
| Environment |
0 to 50°C (32 to 122°F), RH 95% max |
| Dimensions |
50 × 174 × 21 mm (2 × 6.8 × 0.9") |
| Weight |
50 g (1.8 oz.) |
Pool pH Testing Best Practices
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Test frequency: Test pH 2-3 times per week during swimming season
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Sample collection: Collect water at elbow depth, away from return jets and skimmers
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Rinse electrode: Rinse with sample water before testing to avoid contamination
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Allow stabilization: Wait for stability indicator before recording reading
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Clean regularly: Use provided cleaning solution to maintain electrode performance
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Store properly: Store electrode in storage solution when not in use
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Calibrate regularly: Calibrate weekly or when readings seem inconsistent
Understanding Pool pH Levels
Ideal Range: 7.2 - 7.8 pH
pH Too Low (< 7.2):
- Acidic water causes eye and skin irritation
- Corrosion of metal equipment and fixtures
- Etching of plaster and grout
- Reduced chlorine effectiveness
pH Too High (> 7.8):
- Cloudy water appearance
- Scale formation on surfaces and equipment
- Reduced sanitizer efficiency
- Eye and skin irritation
- Filter clogging
The HI981004's 0.01 pH resolution gives you the precision needed to maintain optimal pH levels and avoid these problems.
Replacement Parts & Accessories
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HI1271: Replacement pH electrode
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HI70004P: pH 4.01 buffer solution
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HI70007P: pH 7.01 buffer solution
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HI70010P: pH 10.01 buffer solution
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HI70300: Storage solution for pH electrodes
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HI700601: Electrode cleaning solution
Why Choose Hanna Pool Line?
Hanna's Pool Line series is specifically designed for pool and spa professionals and enthusiasts. With over 40 years of experience in analytical instrumentation, Hanna understands the unique challenges of pool water testing. The HI981004 combines professional accuracy with user-friendly operation and exceptional value, making it the ideal choice for anyone serious about pool water quality.
Warranty & Support
The HI981004 Pool Line Checker® Plus is backed by Hanna's quality guarantee and customer support. For technical assistance, calibration questions, or replacement parts, our expert team is ready to help.
