Hanna GroLine Quick Calibration Solution for pH & EC Meters

Hanna GroLine Quick Calibration Solution provides a convenient single-point standard for compatible Hanna GroLine pH and EC/TDS meters. Its combined formulation allows supported instruments to calibrate pH and conductivity sensors using one solution, helping growers maintain dependable measurements while simplifying routine meter maintenance.

The solution provides a pH reference value of 6.86 and an electrical conductivity reference value of 5.00 mS/cm, or 5,000 µS/cm, at 25°C. It is designed for instruments equipped with Hanna’s Quick Cal calibration function, including compatible GroLine combination meters and monitors.

Key Benefits

• Combined pH and EC calibration: Provides reference values for both pH and electrical conductivity in one solution.
• Simplifies meter maintenance: Reduces the number of separate standards needed for supported Quick Cal instruments.
• Single-point calibration: Designed specifically for the Quick Cal function found on compatible Hanna GroLine meters.
• Reliable reference values: Provides pH 6.86 and EC 5.00 mS/cm at 25°C.
• High-quality production: Manufactured using high-purity salts, deionized water, certified balances, Class A glassware, and temperature-controlled processes.
• Traceable packaging: Lot number and expiration information are marked on the product packaging.
• Multiple packaging options: Select the preferred variant before ordering.

Calibration Values

• pH reference value: 6.86 at 25°C
• pH accuracy: ±0.02 pH
• EC reference value: 5.00 mS/cm at 25°C
• Equivalent conductivity: 5,000 µS/cm at 25°C
• Calibration type: Single-point Quick Cal
• Supported parameters: pH and electrical conductivity

The meter may use the conductivity value to calibrate EC and calculate related TDS or ppm readings according to its configured conversion factor.

Compatible Instruments

This solution is intended for Hanna GroLine meters, monitors, and testers that specifically support the Quick Cal function and recognize the combined pH 6.86 and EC 5.00 mS/cm standard.

Compatibility depends on the instrument model. Review the meter’s instruction manual before calibration. Do not assume that every Hanna pH meter, EC meter, or third-party instrument supports this combined standard.

How to Use

1. Inspect the meter and probes for residue, salt deposits, or visible contamination.
2. Clean the probes with an appropriate electrode-cleaning solution when necessary.
3. Rinse the pH and conductivity sensors with distilled or deionized water.
4. Pour fresh Quick Calibration Solution into a clean calibration container or open a fresh individually packaged portion.
5. Immerse the sensors according to the meter manufacturer’s instructions.
6. Select the meter’s Quick Cal calibration mode.
7. Gently stir or move the probe to release trapped air bubbles, especially around the conductivity sensor.
8. Wait for the reading to stabilize and allow the instrument to complete calibration.
9. Rinse the probes after calibration and return them to their recommended operating or storage condition.

Always follow the instructions supplied with the meter, as button sequences and calibration indicators differ between models.

Best Practices for Accurate Calibration

• Use fresh, uncontaminated solution for every calibration session.
• Allow the solution and meter to reach a stable temperature before calibration.
• Confirm that the meter recognizes the correct Quick Cal standard.
• Use a clean container that is free from fertilizer, buffer, and cleaning-solution residue.
• Never pour used calibration solution back into the original package.
• Keep the original container tightly sealed when not in use.
• Avoid touching probe sensing surfaces with fingers or dirty tools.
• Remove air bubbles from conductivity probe openings.
• Calibrate after cleaning, extended storage, probe replacement, or whenever readings appear questionable.
• Follow the expiration and lot information printed on the selected package.

When to Calibrate

Calibration frequency depends on how often the meter is used, the cleanliness of the samples, and the accuracy required. Consider calibrating:

• Before an important nutrient mixing or reservoir adjustment
• After cleaning the probe
• After replacing a pH or conductivity electrode
• Following extended meter storage
• When readings become slow, unstable, or unexpected
• After testing concentrated fertilizers or heavily contaminated solutions
• At the interval recommended in the instrument manual

Frequent hydroponic and greenhouse users may benefit from establishing a regular calibration schedule.

Manufacturing Standards

Hanna Quick Calibration Solution is produced in accordance with ISO 3696 and BS 3978 standards. High-purity ingredients and controlled manufacturing processes help provide a consistent reference for supported GroLine meters.

Each package is marked with lot and expiration information for product identification and quality control.

Important Usage Notes

This is a calibration standard. It is not a pH probe storage solution, electrode-cleaning solution, nutrient additive, or pH-adjusting product.

Do not use the solution to raise or lower reservoir pH. Do not store pH electrodes in Quick Calibration Solution for extended periods. Use an appropriate Hanna electrode storage solution to keep compatible pH probes hydrated between uses.

Calibration results are only valid when the meter supports the specified Quick Cal values and the solution has not been contaminated, diluted, or used beyond its expiration date.