Product Description
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
Pool-specific design – Engineered for swimming pool, hot tub, and spa water testing
High precision – 0.01 pH resolution with ±0.2 pH accuracy for reliable water balance
Replaceable electrode – HI1271 gel-filled electrode extends tester life indefinitely
Automatic calibration – One or two-point auto calibration with buffer recognition
Simple operation – Single button controls ON/OFF and calibration
Temperature measurement – Displays both pH and temperature simultaneously
Long battery life – Up to 1000 hours continuous use with CR2032 battery
Complete kit – Includes electrode, buffers, cleaning solution, battery, and carrying case
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:
pH reading: 0.01 resolution for precise measurements
Temperature: Simultaneous temperature display
Stability indicator: Confirms when reading is stable and ready to record
Low-battery indicator: Alerts you when battery needs replacement
Calibration tags: Shows which buffers were used for calibration
Replaceable HI1271 pH Electrode
The included HI1271 gel-filled pH electrode offers several advantages:
Tapered design: Fits easily into containers with small openings
Gel-filled: Maintenance-free, no refilling required
Durable construction: Plastic body reduces maintenance needs
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:
HI1271 pH electrode: Replaceable gel-filled electrode with tapered design
pH 4.01 buffer sachets (2): For calibration
pH 7.01 buffer sachets (2): For calibration
Electrode cleaning solution sachets (2): Keeps electrode in optimal condition
CR2032 Li-ion battery: Pre-installed for immediate use
Carrying case: Protects tester and accessories
Quality certificate: Hanna quality assurance documentation
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
Test frequency: Test pH 2-3 times per week during swimming season
Sample collection: Collect water at elbow depth, away from return jets and skimmers
Rinse electrode: Rinse with sample water before testing to avoid contamination
Allow stabilization: Wait for stability indicator before recording reading
Clean regularly: Use provided cleaning solution to maintain electrode performance
Store properly: Store electrode in storage solution when not in use
Calibrate regularly: Calibrate weekly or when readings seem inconsistent
Understanding Pool pH Levels
Ideal Range: 7.2 - 7.8 pH
pH Too Low (
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
HI1271: Replacement pH electrode
HI70004P: pH 4.01 buffer solution
HI70007P: pH 7.01 buffer solution
HI70010P: pH 10.01 buffer solution
HI70300: Storage solution for pH electrodes
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.
