Easy-to-use waterproof pH tester that makes monitoring water quality simple and accurate. The Hanna HI98107 pHep® delivers reliable pH measurements with 0.1 resolution and ±0.2 pH accuracy, featuring automatic two-point calibration, temperature compensation, and a unique cloth junction electrode—all in a slim, pocket-sized design perfect for drinking water, aquariums, pools, and ponds.
Key Features & Benefits
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Waterproof design – Fully waterproof for poolside and field use
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Dual display – Large multi-level LCD shows pH and temperature simultaneously
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Cloth junction electrode – Larger surface area than ceramic for faster, more stable readings
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Auto calibration – Automatic two-point calibration with buffer recognition (pH 4.01, 7.01, 10.01)
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Temperature compensation – Built-in ATC with exposed sensor for rapid measurements
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Ultra-slim design – Only 17mm thick, fits comfortably in hand or pocket
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Long battery life – Up to 1000 hours continuous use with CR2032 battery
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Two-button operation – Simple ON/OFF and calibration buttons
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Complete kit – Includes buffers, cleaning solution, battery, and protective sleeve
Perfect for Water Quality Testing
The HI98107 pHep® is ideal for a wide range of water testing applications:
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Drinking water: Monitor tap water, well water, and bottled water pH
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Aquariums: Maintain optimal pH for freshwater and saltwater fish health
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Swimming pools & spas: Quick poolside pH testing for water balance
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Ponds: Monitor koi ponds, ornamental ponds, and water features
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Hydroponics: Track nutrient solution pH for optimal plant growth
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Environmental testing: Field testing of streams, lakes, and water bodies
Advanced Technology in a Pocket Design
Large Multi-Level LCD Display
The 29mm × 20mm LCD is designed for easy reading in any lighting condition, displaying:
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pH reading: 0.1 resolution from 0.0 to 14.0 pH
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Temperature: Simultaneous display in °C or °F
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Stability indicator: Clock icon disappears when reading is stable
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Calibration tags: Shows which buffers were used for calibration
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Battery level: Percent indication at startup, low battery warning
Unique Cloth Junction Electrode
The HI98107 features a unique reference cell design with a cloth junction that provides a larger surface area than standard ceramic junctions. This innovative design offers:
- Faster response times for quicker measurements
- More stable readings in varying sample conditions
- Better electrical contact with samples
- Extractable junction for extended electrode life
Integrated Temperature Sensor
An exposed temperature sensor allows for rapid automatic temperature compensated pH measurements. The sensor quickly equilibrates with sample temperature, ensuring accurate pH readings regardless of temperature variations from 0 to 50°C. Temperature can be displayed in either °C or °F to match your preference.
Automatic Two-Point Calibration
Calibration is performed by simply pressing the dedicated calibration button. The meter can be calibrated to one or two points using pre-programmed standard buffers (pH 4.01, 7.01, 10.01). When the standard value is recognized and stability is reached, the meter automatically accepts and stores the calibration value—no manual entry required.
User-Friendly Design Features
Slim, Ergonomic Design
With rounded edges and a case that is only 17mm (0.7") thick, the HI98107 is ultra-slim and fits comfortably in your hand or pocket. At just 75g (2.6 oz), it's lightweight enough to carry anywhere.
Two-Button Operation
Simple operation with just two buttons—one for ON/OFF, the other for calibration. No complicated menus or settings to navigate during normal use.
Stability Indicator
A clock icon stability indicator appears on the display and disappears when the reading is stable, eliminating guesswork and ensuring you record accurate measurements.
Flexible Auto Shut-Off
User-selectable automatic shut-off conserves battery life. Choose from 8 minutes, 60 minutes, or disabled to match your testing workflow. Settings are accessed via a button in the battery compartment.
Battery Status Monitoring
At startup, the meter displays the remaining battery life as a percentage. A low battery indicator appears when less than 10% battery life remains, giving you advance warning to replace the battery.
Complete Kit - Ready to Test
The HI98107 pHep® arrives with everything needed for immediate water testing:
- HI98107 pHep® pH tester with cloth junction electrode
- CR2032 3V Li-ion battery (pre-installed)
- pH 4.01 buffer solution sachet
- pH 7.01 buffer solution sachets (2)
- Electrode cleaning solution sachet
- Storage/protection sleeve
- Quality certificate
- Instruction manual
Technical Specifications
| Specification |
Detail |
| SKU |
HI98107 |
| pH Range |
0.0 to 14.0 pH |
| pH Resolution |
0.1 pH |
| pH Accuracy (@25°C/77°F) |
±0.2 pH |
| pH Calibration |
Automatic, two-point with buffer recognition |
| pH Temperature Compensation |
Automatic, 0 to 50°C |
| Temperature Range |
0.0 to 50.0°C / 32.0 to 122.0°F |
| Temperature Resolution |
0.1°C / 0.1°F |
| Temperature Accuracy |
±0.5°C / ±1°F |
| Electrode Type |
Built-in with cloth junction (extractable) |
| Automatic Shut-Off |
8 minutes, 60 minutes, or disabled (user-selectable) |
| Battery Type / Life |
CR2032 3V Li-ion / Approximately 1000 hours continuous use |
| Environment |
0 to 50°C (32 to 122°F); RH 100% max (waterproof) |
| Dimensions |
160 × 40 × 17 mm (6.3 × 1.6 × 0.7") |
| Weight |
75 g (2.6 oz.) |
Applications in Detail
Drinking Water Testing
Monitor the pH of tap water, well water, filtered water, and bottled water. Ideal pH for drinking water is typically 6.5-8.5. The HI98107 helps ensure your water is within safe, comfortable ranges.
Aquarium & Fish Keeping
Maintaining proper pH is critical for fish health. Different species require different pH ranges—freshwater tropical fish typically prefer 6.5-7.5, while African cichlids thrive at 7.8-8.5. The pHep® helps you maintain stable, species-appropriate pH levels.
Pool & Spa Maintenance
Quick poolside pH testing helps maintain optimal water balance (7.2-7.8 pH). Proper pH ensures sanitizer effectiveness, swimmer comfort, and equipment protection. The waterproof design makes the HI98107 perfect for wet poolside environments.
Hydroponics & Agriculture
Most plants prefer slightly acidic nutrient solutions (5.5-6.5 pH). The HI98107 helps you monitor and adjust pH for optimal nutrient uptake and plant growth.
Maintenance & Care
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Storage: Store in the provided protective sleeve when not in use
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Cleaning: Clean electrode regularly with the provided cleaning solution
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Rinsing: Rinse with distilled water between samples to prevent cross-contamination
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Calibration: Calibrate regularly using fresh buffer solutions for optimal accuracy
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Junction renewal: The extractable cloth junction can be pulled out slightly to expose fresh material
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Battery: Replace CR2032 battery when low battery indicator appears
Replacement Parts & Accessories
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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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HI700601: Electrode cleaning solution
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HI70300: Storage solution for pH electrodes
Why Choose the pHep®?
The HI98107 pHep® represents Hanna Instruments' commitment to making professional-grade pH testing accessible and affordable. With over 40 years of experience in analytical instrumentation, Hanna delivers the accuracy, reliability, and ease of use that both professionals and hobbyists demand. The unique cloth junction electrode technology sets the pHep® apart from standard pocket pH testers, delivering faster, more stable measurements.
Warranty & Support
The HI98107 pHep® 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.
