Hanna HALO2 GroLine Wireless Soil pH Tester HI9810302

The Hanna HALO2 GroLine Wireless Soil pH Tester HI9810302 is a compact, Bluetooth-enabled tester designed for measuring pH and temperature in soil, prepared soil samples, and soil slurries. Its specialized conical glass electrode penetrates damp soil and semisolid samples more easily than a conventional round-bulb pH probe, making it a practical tool for indoor gardens, greenhouses, hydroponic facilities, nurseries, and field applications.

Use the HI9810302 as a stand-alone tester with its dual-level LCD or connect it to the Hanna Lab App for expanded calibration, monitoring, documentation, and data-sharing capabilities. A built-in temperature sensor provides fast temperature readings and automatic temperature compensation for accurate pH measurement.

Key Features

• Specialized soil electrode: The conical glass tip is designed to penetrate damp soil, soil slurries, and other semisolid growing media.
• Wireless connectivity: Integrated Bluetooth technology connects the tester to compatible smartphones and tablets.
• Stand-alone operation: Displays pH, temperature, calibration status, stability, and battery information without requiring the app.
• Hanna Lab App support: Access live readings, calibration history, electrode condition, alarms, reminders, notes, data logging, and sharing tools.
• Accurate pH testing: Measures from 0.00 to 12.00 pH with accuracy of ±0.05 pH at 25°C.
• Temperature measurement: Measures sample temperature and applies automatic temperature compensation to the electrode response.
• Open double junction: Helps reduce clogging and improves performance when testing soil and other demanding samples.
• Removable junction sleeve: Allows the junction to be cleaned and the gel electrolyte refreshed as needed.
• Durable PVDF body: Resists abrasion, ultraviolet exposure, fungal growth, and many commonly used chemicals.
• IP65-rated housing: Provides protection from dust, particles, and water jets for greenhouse and outdoor testing.
• Portable design: Compact construction and single-button operation make routine spot checks convenient.

Measurement Specifications

• Model: HI9810302
• pH range: 0.00 to 12.00 pH
• pH resolution: 0.01 or 0.1 pH
• pH accuracy: ±0.05 pH at 25°C
• Temperature range: 0.0 to 60.0°C / 32.0 to 140.0°F
• Temperature resolution: 0.1°C / 0.1°F
• Temperature accuracy: ±0.5°C / ±0.9°F
• Temperature compensation: Automatic; manual compensation is available through the Hanna Lab App
• Calibration: Up to three points as a stand-alone tester or four points through the Hanna Lab App
• Electrode body: PVDF
• Electrode tip: Conical low-temperature glass
• Junction: Open, double junction with removable sleeve
• Reference: Ag/AgCl with refillable gel electrolyte
• Ingress protection: IP65
• Battery: Replaceable CR2032 lithium battery
• Estimated battery life: Approximately 1,000 hours or 500 hours with Bluetooth enabled
• Recommended operating environment: 0 to 50°C / 32 to 122°F

Hanna Lab App Features

Connecting the tester to the Hanna Lab App turns a compatible smartphone or tablet into an expanded pH measurement interface. Available functions include:

• Live pH and temperature readings
• Electrode-condition monitoring
• Time-stamped calibration data
• Calibration reminders
• Adjustable stability criteria
• pH, mV, and temperature alarms
• Measurement tagging and notes
• Tester identification
• Data logging and sharing
• Manual temperature compensation
• Expanded four-point calibration

The tester may also be used independently when wireless features or data logging are not required.

How to Calibrate

For most soil applications, use fresh pH 7.01 and pH 4.01 calibration buffers:

1. Remove the storage cap and rinse away any storage solution or salt deposits.
2. Rinse the electrode tip with purified water and gently blot it dry without rubbing the glass.
3. Enter calibration mode by pressing and holding the ON/OFF button.
4. Begin with pH 7.01 buffer and wait for the tester to recognize and store the stable reading.
5. Rinse the electrode and place it in fresh pH 4.01 buffer.
6. Wait for the second calibration point to stabilize and save.
7. Return the tester to measurement mode.

Use separate rinse and calibration containers when working from bottles. Never return used buffer to the original container. When using the Hanna Lab App, follow the app-guided procedure for calibration at up to four points.

How to Measure Soil pH Directly

1. Inspect the electrode and confirm that the bridge electrolyte gel has not dried out.
2. Calibrate the tester with fresh buffers appropriate for the expected pH range.
3. Use a soil auger or suitable tool to create a pilot hole approximately 20 mm wide.
4. Make each test hole to a consistent depth when comparing multiple locations.
5. Add a small amount of distilled or deionized water so the soil is damp but not saturated.
6. Rinse the electrode with tap water and carefully insert it into the prepared hole.
7. Observe the recommended immersion level and wait for the stability indicator.
8. Record the pH and temperature using the LCD or Hanna Lab App.
9. Gently rinse away remaining soil after the measurement. Do not scrape or wipe the glass tip.

Do not force the electrode directly into hard, compacted, or rocky ground. Doing so can damage the glass tip. For difficult soil, collect a representative sample and prepare it with Hanna HI7051 Soil Preparation Solution according to Hanna’s directions.

Understanding the Results

The preferred pH range varies by plant species, substrate, fertilizer program, and cultivation method. Soil-grown vegetables, tropical houseplants, orchids, container crops, and soilless media may require different targets.

Compare each reading with the recommended range for the specific crop and medium. If adjustment is necessary, consider soil composition, alkalinity, irrigation water, and existing nutrient conditions before applying lime, sulfur, or another pH amendment.

Electrode Care and Storage

• Rinse the probe between samples to prevent cross-contamination.
• Never exceed the marked maximum immersion level.
• Do not rub or wipe the sensitive glass tip.
• Clean sluggish electrodes in an appropriate Hanna cleaning solution for approximately 20 minutes.
• After cleaning, rinse the probe and hydrate it in electrode storage solution for at least 30 minutes before calibration.
• Keep the glass tip and junction hydrated with Hanna electrode storage solution.
• Never store the electrode in distilled or deionized water.
• Use fresh calibration buffers for dependable results.
• Remove and clean the junction sleeve and replenish the gelled bridge electrolyte when performance requires it.
• Handle the conical glass electrode carefully when testing dense media.

What Is Included

• Hanna HI9810302 HALO2 GroLine Wireless Soil pH Tester
• pH 4.01 calibration buffer sachets
• pH 7.01 calibration buffer sachets
• Cleaning solution for soil deposits
• Cleaning solution for humus deposits
• Electrode storage solution
• Gelled bridge electrolyte
• CR2032 lithium battery
• Battery safety information
• Quick-reference guide
• Instrument quality certificate

Important Usage Notes

• This instrument measures pH and temperature; it does not measure soil fertility, nutrient concentration, EC, TDS, or moisture.
• Automatic temperature compensation corrects the electrode response for temperature but does not convert the sample’s pH to a different reference temperature.
• Consistent sampling depth and soil moisture improve comparison between locations.
• Direct testing is intended for damp, penetrable soil—not dry, rocky, or heavily compacted ground.
  • Follow crop- and medium-specific guidance when interpreting results or making pH adjustments.