Hanna Instruments HI98129 Low Range pH/EC/TDS Tester
The Hanna HI98129 is a professional-grade 4-in-1 waterproof tester that measures pH, electrical conductivity (EC), total dissolved solids (TDS), and temperature in a single compact device. Designed specifically for low-range applications (0-3999 µS/cm), this floating pocket meter is ideal for hydroponics, aquariums, drinking water, and laboratory testing where precision at lower conductivity levels is critical.
4-in-1 Multi-Parameter Testing
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pH measurement: 0.00 to 14.00 pH range with ±0.05 pH accuracy
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Electrical Conductivity (EC): 0 to 3999 µS/cm with ±2% full scale accuracy
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Total Dissolved Solids (TDS): 0 to 2000 ppm with ±2% full scale accuracy
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Temperature: 0.0 to 60.0°C (32.0 to 140.0°F) with ±0.5°C accuracy
Advanced Features & Technology
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Waterproof & floating design – Floats if dropped in water for easy retrieval
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Low range optimization – Specifically calibrated for 0-3999 µS/cm applications
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Replaceable pH electrode cartridge – Easy maintenance and extended meter life
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Automatic temperature compensation (ATC) – Ensures accurate readings across temperature ranges
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Selectable EC/TDS conversion – Choose 0.45 or 1.0 conversion factor
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Stability indicator – Shows when reading is stable
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HOLD button – Freezes display for easy recording
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Battery error prevention system (BEPS) – Alerts when battery is too low for accurate readings
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Auto-off function – Conserves battery after 8 minutes of inactivity
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Compact pocket size – Portable and easy to use in the field or lab
Technical Specifications
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pH Range: 0.00 to 14.00 pH
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pH Resolution: 0.01 pH
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pH Accuracy: ±0.05 pH
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pH Calibration: Automatic 1 or 2-point (pH 4.01, 7.01, 10.01)
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EC Range: 0 to 3999 µS/cm
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EC Resolution: 1 µS/cm
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EC Accuracy: ±2% full scale
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TDS Range: 0 to 2000 ppm (mg/L)
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TDS Resolution: 1 ppm
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TDS Accuracy: ±2% full scale
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TDS Conversion Factor: Selectable 0.45 or 1.0
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Temperature Range: 0.0 to 60.0°C (32.0 to 140.0°F)
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Temperature Resolution: 0.1°C / 0.1°F
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Temperature Accuracy: ±0.5°C (±1°F)
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Temperature Compensation: Automatic from 0 to 60°C
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Electrode: Replaceable pH electrode cartridge
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Battery Type: 4 x 1.5V button cell batteries (included)
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Battery Life: Approximately 100 hours continuous use
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Auto-off: After 8 minutes of non-use (can be disabled)
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Dimensions: 175 x 41 x 28 mm (6.9 x 1.6 x 1.1")
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Weight: 1 lb
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Protection Rating: Waterproof and floating
What's Included
- 1 x HI98129 pH/EC/TDS/Temperature Tester
- 1 x Replaceable pH Electrode Cartridge
- 1 x pH 4.01 Buffer Solution (20 mL sachet)
- 1 x pH 7.01 Buffer Solution (20 mL sachet)
- 1 x 1413 µS/cm Conductivity Standard (20 mL sachet)
- 1 x Electrode Storage Solution (2 x 20 mL sachets)
- 4 x 1.5V Button Cell Batteries
- Instrument Quality Certificate
- Instruction Manual
Applications & Use Cases
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Hydroponics: Monitor low-range nutrient solution pH, EC, and TDS for optimal plant growth
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Aquariums & Aquaculture: Test water quality for freshwater systems with low conductivity
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Drinking Water: Verify pH and TDS levels in potable water supplies
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Laboratories: General water quality testing and analysis at low conductivity ranges
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Aquaponics: Monitor water parameters in integrated fish and plant systems
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Education: Teaching water chemistry and quality testing
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Environmental Monitoring: Field testing of freshwater sources, streams, and lakes
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Brewing & Beverage: Quality control for water used in production
Low Range Advantage
The HI98129 is specifically designed for low-range conductivity measurements (0-3999 µS/cm), making it ideal for applications where high precision at lower conductivity levels is essential. This includes freshwater aquariums, drinking water testing, and hydroponic systems using dilute nutrient solutions. The low range design provides better resolution and accuracy compared to high-range meters when measuring these types of water.
Replaceable Electrode Cartridge
Unlike many combo testers with permanently attached electrodes, the HI98129 features a replaceable pH electrode cartridge. This design extends the life of your meter—when the electrode wears out, simply replace the cartridge instead of buying a new meter. The cartridge design also makes storage and maintenance easier.
Why Choose the Hanna HI98129?
Rated 5.0 out of 5 stars by customers, the HI98129 combines professional accuracy with rugged portability. The waterproof floating design means you can use it confidently near water without worry, while the low-range optimization ensures precise measurements for freshwater applications. With automatic temperature compensation, selectable TDS conversion factors, and a stability indicator, this meter delivers laboratory-grade results in a pocket-sized package.
Perfect for: Freshwater aquarium hobbyists, hydroponics growers (low EC systems), drinking water testing, aquaponics operations, water quality labs, environmental monitoring, brewing & beverage production, educational institutions.
Manufacturer: Hanna Instruments - trusted worldwide for precision water testing equipment since 1978.
