Product Description
Lightweight, waterproof pH tester with replaceable electrode for years of reliable service. The Hanna HI98127 pHep®4 delivers accurate pH measurements with 0.1 resolution and ±0.1 pH accuracy, featuring automatic temperature compensation, a floating waterproof design, and the HI73127 replaceable electrode with extractable cloth junction—making it ideal for environmental testing, field work, laboratory applications, aquariums, and hydroponics.
Key Features & Benefits
Replaceable electrode – HI73127 cartridge design extends tester life indefinitely
Waterproof & floats – IP67 rated, designed to float if dropped in water
Accurate measurements – 0.1 pH resolution with ±0.1 pH accuracy
Auto calibration – One or two-point automatic calibration with dual buffer sets
Temperature compensation – Automatic ATC displays pH and temperature simultaneously
Extractable cloth junction – Renewable junction extends electrode life
Expanded pH range – Measures from -2.0 to 16.0 pH
Long battery life – Up to 300 hours continuous use with 4 AAA batteries
Sleek, ergonomic design – Lightweight and comfortable to hold
Replaceable Electrode = Long-Term Value
Unlike disposable pH testers that must be replaced entirely when the electrode wears out, the pHep®4 features a replaceable HI73127 electrode. When your electrode eventually degrades, simply replace it for a fraction of the cost of a new meter. This design protects your investment and ensures you can rely on this tester for years of accurate pH measurements.
Advanced Electrode Technology
HI73127 Replaceable pH Electrode
The pHep®4 features the innovative HI73127 electrode with several advanced features:
Stainless steel round connector: Cartridge design with no pins to line up or break
Extractable cloth junction: Pull out ⅛" of junction to expose fresh material
Junction renewal: Clears clogging and restores response time without replacing electrode
Glass body: Chemically resistant and quick to reach thermal equilibrium
Easy replacement: Simple screw-on/screw-off design when replacement is needed
The extractable cloth junction is a unique feature that extends electrode life. When you notice slower response times or clogging, simply pull out ⅛" of the cloth junction to expose fresh material. This clears any buildup and restores fast response time, significantly extending the electrode's useful life.
Professional Features for Confident Testing
Waterproof & Floating Design
IP67 waterproof rating protects the tester in wet environments and field conditions. The floating design ensures that if you accidentally drop the pHep®4 in a tank, pool, or water body, it won't sink—simply retrieve it from the surface and continue testing.
Automatic Temperature Compensation (ATC)
Built-in temperature sensor provides automatic temperature compensation for all pH readings, ensuring accuracy across the temperature range of -5.0 to 60.0°C (23.0 to 140.0°F). Temperature is displayed in °C or °F along with the pH reading on the large LCD.
Dual Display
The large LCD displays both pH and temperature readings simultaneously, eliminating the need to switch between modes. Additional indicators include:
Stability indicator: Clock icon disappears when reading is stable
Calibration tags: Shows which buffers were used
Battery status: Alerts when battery needs replacement
Flexible Calibration Options
Automatic one or two-point calibration with two selectable buffer sets for maximum flexibility:
Buffer Set 1: pH 4.01, 7.01, 10.01
Buffer Set 2: pH 4.01, 6.86, 9.18
Choose the buffer set that best matches your testing requirements and application.
HOLD Button
The HOLD button freezes the reading on the display, allowing you to record measurements in challenging environments or when you need to document results away from the sample.
BEPS (Battery Error Prevention System)
The meter will automatically shut off if there is not enough battery power to get an accurate measurement, preventing false readings due to low battery.
Auto-Off Function
The meter automatically shuts off after 8 minutes of non-use to maximize battery life and prevent accidental drain if left on.
Expanded pH Range
The pHep®4 measures from -2.0 to 16.0 pH, handling extreme acidic and alkaline solutions. This expanded range makes it suitable for diverse applications from industrial testing to environmental monitoring.
Applications
Environmental water testing and field sampling
Laboratory quality control and research
Aquariums and aquaculture (freshwater and saltwater)
Hydroponics and agriculture
Swimming pools and spas
Food and beverage testing
Wastewater monitoring
Educational laboratories
Industrial process control
General-purpose pH measurement
Complete Kit - Ready to Test
The HI98127 pHep®4 arrives with everything needed for immediate testing:
HI98127 pHep®4 pH/temperature tester
HI73127 replaceable pH electrode
HI73128 electrode removal tool
pH buffer solution sachets for calibration
Electrode cleaning solution sachet
Electrode storage solution sachet
1.5V AAA batteries (4 pcs.)
Instruction manual
Quality certificate
Technical Specifications
Specification
Detail
SKU
HI98127
pH Range
-2.0 to 16.0 pH
pH Resolution
0.1 pH
pH Accuracy (@25°C/77°F)
±0.1 pH
pH Calibration
Automatic, one or two-point with two buffer sets (pH 4.01/7.01/10.01 or 4.01/6.86/9.18)
pH Temperature Compensation
Automatic (ATC)
Temperature Range
-5.0 to 60.0°C / 23.0 to 140.0°F
Temperature Resolution
0.1°C / 0.1°F
Temperature Accuracy
±0.5°C / ±1°F
pH Electrode
HI73127 replaceable electrode with extractable cloth junction
Waterproof Rating
IP67 (waterproof and floats)
Automatic Shut-Off
Auto-off after 8 minutes of non-use
Battery Type / Life
1.5V AAA (4) / Approximately 300 hours continuous use
Environment
-5 to 50°C (23 to 122°F); RH max 100%
Dimensions
163 × 40 × 26 mm (6.4 × 1.6 × 1.0")
Weight
100 g (3.5 oz.)
Electrode Care & Maintenance
Storage: Store electrode in storage solution to keep glass membrane hydrated
Cleaning: Clean regularly with electrode cleaning solution to remove buildup
Junction renewal: Pull out ⅛" of cloth junction to expose fresh material when response slows
Calibration: Calibrate regularly using fresh buffer solutions for optimal accuracy
Replacement: When electrode performance degrades, replace with HI73127 electrode
Replacement Parts & Accessories
HI73127: Replacement pH electrode with extractable cloth junction
HI70004P: pH 4.01 buffer solution
HI70007P: pH 7.01 buffer solution
HI70010P: pH 10.01 buffer solution
HI700601: Electrode cleaning solution
HI70300: Storage solution for pH electrodes
Why Choose the pHep®4?
The HI98127 pHep®4 represents Hanna Instruments' commitment to combining professional accuracy with user-friendly operation and long-term value. The replaceable electrode design with extractable cloth junction sets it apart from disposable testers, while the waterproof, floating design makes it ideal for field and wet environment testing. Whether you're a laboratory technician, environmental scientist, aquarium hobbyist, or hydroponic grower, the pHep®4 delivers the accuracy and reliability you need at an affordable price.
Lightweight & Ergonomic
The sleek, lightweight design (100g / 3.5 oz) makes the pHep®4 comfortable to hold and easy to carry. The ergonomic shape fits naturally in your hand for extended testing sessions without fatigue.
Warranty & Support
The HI98127 pHep®4 is backed by Hanna's quality guarantee and customer support. For technical assistance, calibration questions, or replacement electrodes, our expert team is ready to help.
