Professional pH testing designed specifically for hydroponic nutrient solutions. The Hanna HI98115 GroLine Hydroponics pH Tester delivers accurate pH measurements with 0.01 resolution and ±0.2 pH accuracy, featuring a replaceable electrode, one-button operation, and automatic calibration—making it the ideal choice for hydroponic growers who need reliable, affordable pH monitoring.
Key Features & Benefits
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Hydroponics-specific design – Engineered for measuring pH in nutrient solutions
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Replaceable electrode – HI1271 gel-filled electrode extends tester life indefinitely
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High precision – 0.01 pH resolution with ±0.2 pH accuracy
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One-button operation – All functions including ON/OFF and calibration with single button
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Auto calibration – Automatic one or two-point calibration with buffer recognition
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Tapered electrode – 8mm tip fits test tubes, vials, and small containers
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Long battery life – Up to 1000 hours continuous use with CR2032 battery
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Complete kit – Includes carrying case, electrode, buffers, and cleaning solutions
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Affordable – Professional features at a price accessible to all growers
Why pH Matters in Hydroponics
pH is one of the most critical parameters in hydroponic growing. Maintaining optimal pH levels (typically 5.5-6.5) ensures:
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Maximum nutrient uptake: Plants can only absorb nutrients within specific pH ranges
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Prevent nutrient lockout: Incorrect pH makes nutrients unavailable to plants
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Healthy plant growth: Optimal pH promotes vigorous growth and higher yields
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Disease prevention: Proper pH helps prevent root diseases and pathogens
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Consistent results: Stable pH leads to predictable, repeatable growing outcomes
Designed for Hydroponic Growers
The HI98115 GroLine tester is specifically designed for the unique needs of hydroponic cultivation. Whether you're growing in NFT, DWC, ebb and flow, or any other hydroponic system, the GroLine tester provides the accuracy and reliability you need to maintain optimal nutrient solution pH. 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 Easy Operation
One-Button Simplicity
The HI98115 is incredibly simple to operate with all functions performed with a single button. Turn on/off, calibrate, and take readings—all with one button. This streamlined design makes the tester accessible to growers of all experience levels.
Large Enhanced 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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Stability indicator: Hourglass icon disappears when reading is stable
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Calibration tags: Shows which buffers were used for calibration
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Low battery indicator: Alerts you when battery needs replacement
Replaceable HI1271 pH Electrode
The supplied HI1271 gel-filled pH electrode offers several advantages for hydroponic testing:
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Tapered design: 103mm long, tapering to 8mm diameter at sensing end
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Fits small containers: Easily fits into test tubes, vials, and narrow-mouth bottles
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Gel-filled: Maintenance-free, no refilling required
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Plastic body: Durable construction reduces maintenance needs
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Easy replacement: Simple screw-on/screw-off design when replacement is needed
Automatic Calibration with Buffer Recognition
The HI98115 is calibrated automatically to one or two points. The calibration buffers are automatically recognized, and after calibration, the buffer values used are shown on the display as tags. This ensures proper calibration every time and provides documentation of which buffers were used.
Stability Indicator
An hourglass indicator is displayed on the LCD until a stable reading is obtained. Once a reading stabilizes, the indicator disappears, signaling that you can record the measurement with confidence.
Flexible Auto Shut-Off
The meter can be set to automatically turn off after 8 minutes or 60 minutes to conserve battery life if the meter is left on. The auto-off feature can also be disabled for continuous monitoring applications.
Exceptional Battery Life
The HI98115 has an exceptionally long battery life of approximately 1000 hours. When battery power is running low, a low battery indicator is displayed, giving you advance warning to replace the battery.
Complete Kit in Durable Carrying Case
The HI98115 is supplied complete with everything needed for hydroponic pH testing, all packaged in a durable plastic carrying case:
- HI98115 GroLine pH tester
- HI1271 replaceable pH electrode
- pH 4.01 buffer solution sachets (2)
- pH 7.01 buffer solution sachets (2)
- Electrode cleaning solution sachets (2)
- CR2032 Li-ion battery
- Quality certificate
- Instruction manual
- Plastic carrying case
Applications
- Hydroponic nutrient solution testing
- NFT (Nutrient Film Technique) systems
- DWC (Deep Water Culture) systems
- Ebb and flow systems
- Drip irrigation systems
- Aeroponics
- Aquaponics
- Indoor growing operations
- Commercial greenhouses
- Home hobbyist growing
Technical Specifications
| Specification |
Detail |
| SKU |
HI98115 |
| 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) |
| Automatic Shut-Off |
8 minutes, 60 minutes, or disabled (user-selectable) |
| Battery Type / Life |
CR2032 Li-ion / Approximately 1000 hours continuous use |
| 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.) |
Optimal pH Ranges for Hydroponic Growing
Different plants and growing systems have different optimal pH ranges:
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General hydroponics: 5.5 - 6.5 pH
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Leafy greens: 6.0 - 7.0 pH
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Fruiting plants (tomatoes, peppers): 5.5 - 6.5 pH
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Herbs: 5.5 - 6.5 pH
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Cannabis: 5.5 - 6.5 pH (vegetative), 6.0 - 6.5 pH (flowering)
The HI98115's 0.01 pH resolution gives you the precision needed to maintain these tight pH ranges for optimal plant health and yields.
pH Testing Best Practices for Hydroponics
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Test frequency: Check pH daily, or twice daily for critical growth stages
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Test after mixing: Always test pH after adding nutrients to water
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Allow equilibration: Let nutrient solution mix thoroughly before testing
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Rinse electrode: Rinse with distilled water between tests
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Calibrate regularly: Calibrate weekly or when readings seem inconsistent
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Clean electrode: Use cleaning solution to remove nutrient buildup
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Store properly: Store electrode in storage solution when not in use
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Monitor trends: Track pH over time to identify patterns and prevent 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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HI700601: Electrode cleaning solution
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HI70300: Storage solution for pH electrodes
Why Choose GroLine?
Hanna's GroLine series is specifically designed for agricultural and horticultural applications, with a focus on hydroponics. The HI98115 combines professional-grade accuracy with user-friendly operation and exceptional value, making it accessible to growers at all levels—from home hobbyists to commercial operations. The replaceable electrode design and long battery life ensure years of reliable service, while the one-button operation makes it simple enough for anyone to use.
Economical Professional Solution
The HI98115 is a full-featured pH tester at a price that anyone who needs to measure pH can afford. You get professional accuracy, replaceable electrode, automatic calibration, and a complete kit with carrying case—all at a fraction of the cost of more expensive meters. This makes it the perfect choice for growers who need reliable pH testing without breaking the budget.
Warranty & Support
The HI98115 GroLine Hydroponics pH Tester 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.
