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pH

Parameter Selection

Application Importance of pH in Hydroponics

pH influences several factors that play an important role in plant growth. These factors include nutrient availability and nutrient toxicity. Most minerals and nutrients are more available to plants in acidic environments than in neutral or alkaline environments. While most plants can survive in the same pH range of 5.0 to 7.5, each plant has a specific pH value in which it optimally absorb nutrients. Beyond a certain pH value, nutrients become unavailable to plants. This is due to the solubility of minerals and nutrients. Furthermore, pH has a huge impact on the solubility of fertilizer. If the water is not the correct pH balance, some nutrients precipitate out of solution (i.e. not dissolved) and can no longer be absorbed or used by plants. For example, above a pH of 6.5, some nutrients such as iron, will begin to precipitate out of solution. In a hydroponic system it is important to maintain a pH range of 5.5 to 6.5 for optimum nutrition uptake.

Meters

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HI5000 Series Research Grade Laboratory Benchtops

The HI5000 series is our most advanced benchtop pH meters incorporating the latest microprocessor to bring exceptional features and performance for the most demanding user. These meters are completely customizable to user specific requirements. These research grade meters have many features including:

  • CAL Check pH diagnostics to ensure accurate measurements
  • Easy to use as you are guided through every aspect of operation
  • Large color LCD that is sharp and easy to read
  • Factory calibration service plan available
  • Capacitive Touch Keypad that is easy to clean
  • Logging and USB connection for data management
  • 4 models to choose from:
    • 1 or 2 input channels
    • pH, ISE and/or Conductivity/TDS probe inputs
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HI5000 Series Research Grade Laboratory Benchtops

The HI5000 series is our most advanced benchtop pH meters incorporating the latest microprocessor to bring exceptional features and performance for the most demanding user. These meters are completely customizable to user specific requirements. These research grade meters have many features including:

  • CAL Check pH diagnostics to ensure accurate measurements
  • Easy to use as you are guided through every aspect of operation
  • Large color LCD that is sharp and easy to read
  • Factory calibration service plan available
  • Capacitive Touch Keypad that is easy to clean
  • Logging and USB connection for data management
  • 4 models to choose from:
    • 1 or 2 input channels
    • pH, ISE and/or Conductivity/TDS probe inputs
Shop Now >

edge pH meters

The versatile edge pH meters are just a 1/2” thick and can be used as a benchtop, portable or as a wall mount to save valuable bench space.

edge® meters feature:

  • Capacitive touch keypad
  • Digital pH electrodes with built in temperature sensor
  • Built-in rechargeable battery
  • GLP Data for tracking calibration data
  • CAL Check pH diagnostics
  • USBs for flash drive or computer connectivity

The edge family of meters include multi-parameter versions that can be upgraded to measure other parameters including EC and DO and a dedicated version that only measures pH.

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Portable pH Meters

Portable meters provide the versatility to bring the meter to the sample. For the hydroponics grower we offer a simple two button operation along with multiparameter versions that measure pH/ORP, Conductivity (EC) and Total Dissolved Solids (TDS). Also available are application specific models that have a Quick Cal Mode in which one solution calibrates both pH and conductivity sensors.

Application Specific Meter Features:

  • Simple two button operation
  • Meters that measure pH, pH/EC/TDS, and pH/ORP
  • Some models with Quick Cal Mode

Professional Portable Meter Features:

  • CAL Check Diagnostics
  • Single parameter and multiparameter versions to choose from
    • USB for data transfer
    • pH/ISE versions for use with ion selective electrodes
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Portable pH Meters

Portable meters provide the versatility to bring the meter to the sample. For the hydroponics grower we offer a simple two button operation along with multiparameter versions that measure pH/ORP, Conductivity (EC) and Total Dissolved Solids (TDS). Also available are application specific models that have a Quick Cal Mode in which one solution calibrates both pH and conductivity sensors.

Application Specific Meter Features:

  • Simple two button operation
  • Meters that measure pH, pH/EC/TDS, and pH/ORP
  • Some models with Quick Cal Mode

Professional Portable Meter Features:

  • CAL Check Diagnostics
  • Single parameter and multiparameter versions to choose from
    • USB for data transfer
    • pH/ISE versions for use with ion selective electrodes
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Professional Pocket pH Tester

Pocket meters are more affordable than portable pH meters while having many of the same features. These professional pocket pH testers offer a simple two button operation and feature an extractable cloth junction that allows for simple clearing of junctions. These powerful meters include the following features:

  • Waterproof
  • Replaceable pH electrode
  • Automatic Temperature Compensation
  • Some models with Quick Cal mode
  • Multi-level display showing pH and Temperature simultaneously
  • Mulitparameter versions
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Economical Pocket pH Meters

Basic pocket meters and testers are an affordable way to measure the pH of a hydroponic nutrient solution. They are simple to operate and allows everyone, from the hobbyist to professional, to measure pH accurately and economically. These meters feature:

  • Automatic Calibration to one or two points
  • Stability Indicator
  • Automatic shut off
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Economical Pocket pH Meters

Basic pocket meters and testers are an affordable way to measure the pH of a hydroponic nutrient solution. They are simple to operate and allows everyone, from the hobbyist to professional, to measure pH accurately and economically. These meters feature:

  • Automatic Calibration to one or two points
  • Stability Indicator
  • Automatic shut off
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Halo pH Electrode

Halo Bluetooth Smart pH electrodes allow the ability touse a compatible Apple or Android device as a professional pH meter using the Hanna Lab App.

The HI12302 Halo pH electrode includes a built-in temperature sensor for automatic temperature compensated measurements and is composed of a durable polyetherimide (PEI) resin body. Other features include:

  • Gel filled, double reference junction design
  • Calibration reminder and measurement alarms
  • Ability to log and share data
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Electrodes

HI1131 Laboratory pH electrode

The HI1131 is a standard laboratory pH electrode that is commonly used on benchtop pH meters. The glass body is a good conduction of temperature allowing the reference cell to equilibrate with temperature of the sample . The HI1131 is a refillable pH electrode.

  • Glass body for fast thermo-equilibrium
  • Refillable with 3.5M KCl
  • Double Junction design
  • Ceramic junction
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HI1131 Laboratory pH electrode

The HI1131 is a standard laboratory pH electrode that is commonly used on benchtop pH meters. The glass body is a good conduction of temperature allowing the reference cell to equilibrate with temperature of the sample . The HI1131 is a refillable pH electrode.

  • Glass body for fast thermo-equilibrium
  • Refillable with 3.5M KCl
  • Double Junction design
  • Ceramic junction
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HI1230 Field Use pH Electrode

The HI1230 is a rugged field pH electrode that is commonly used on portable pH meters. The chemically resistant plastic body protects protects this probe from accidental breakage. The HI1230 is gel filled so no refill solution is required.

  • PEI plastic unbreakable body
  • Maintenance free gel filled version
  • Double Junction design
  • Ceramic junction
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Calibration Solutions

GroLine Calibration Solutions

The Hanna GroLine family consists of standard calibration solutions as well as a Quick Calibration solution. The Quick Calibration Solution is used with the Quick Cal function found in compatible GroLine pH and EC/TDS meters. The Quick Cal function allows for a single point calibration for pH and/or conductivity sensors.

Quick Calibration Solution

  • pH calibration value of pH 6.86
  • EC calibration value of 5,000 μS/cm (5.00 mS/cm)
  • Produced in accordance with ISO 3696/BS3978 standards
  • Available in a variety of sizes
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Standard GroLine pH Buffers

  • Accuracy to ±0.02 pH
  • Supplied with Certificate of Analysis
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    GroLine Calibration Solutions

    The Hanna GroLine family consists of standard calibration solutions as well as a Quick Calibration solution. The Quick Calibration Solution is used with the Quick Cal function found in compatible GroLine pH and EC/TDS meters. The Quick Cal function allows for a single point calibration for pH and/or conductivity sensors.

    Quick Calibration Solution

    • pH calibration value of pH 6.86
    • EC calibration value of 5,000 μS/cm (5.00 mS/cm)
    • Produced in accordance with ISO 3696/BS3978 standards
    • Available in a variety of sizes
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    Standard GroLine pH Buffers

  • Accuracy to ±0.02 pH
  • Supplied with Certificate of Analysis
  • Shop Now >

    Standard pH Calibration Buffer

    The 7000 series are basic pH calibration buffers. They include the standard pH 4.01, 7.01 and 10.01 buffer values. These buffers are NIST traceable and accurate to ±0.01 pH.

    • Accurate to ±0.01 pH
    • Available in variety of sizes
    • Available with color dye added for easy identification
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    Maintenance Solutions

    pH Electrode Refill Solutions

    Maintaining a proper filling solution level in a refillable pH electrode is critical to obtaining accurate and reliable pH measurements. The solution not only provides an electrical pathway to the internal reference but maintaining an ideal level ensures there is adequate head pressure to ensure flow through the junction into the sample.

    • Solutions for both single and double junction electrodes
      • Single junction electrodes use 3.5 M KCl with silver chloride
      • Double junction electrodes use 3.5 M KCl
    • Available in a variety of sizes
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    pH Electrode Refill Solutions

    Maintaining a proper filling solution level in a refillable pH electrode is critical to obtaining accurate and reliable pH measurements. The solution not only provides an electrical pathway to the internal reference but maintaining an ideal level ensures there is adequate head pressure to ensure flow through the junction into the sample.

    • Solutions for both single and double junction electrodes
      • Single junction electrodes use 3.5 M KCl with silver chloride
      • Double junction electrodes use 3.5 M KCl
    • Available in a variety of sizes
    Shop Now >

    Application Specific Cleaning Solutions

    These application specific cleaning solutions are designed to clean pH electrodes used in agricultural settings. Any drag out of nutrients from the reservoir tank to a storage solution will provide nutrients for biological growth. Using these cleaning solution will ensure that the probe is effectively cleaned.

    • Specially formulated cleaning solution for agricultural applications to remove deposits from a pH electrode
    • Available in a variety of sizes including convenient, one-time use sachets to ensure freshness of the solution
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    General Purpose Cleaning Solutions

    Maintaining a clean pH electrode is critical to obtaining accurate and reliable pH measurements. General purpose cleaning solution can be used for a variety of applications.Hanna offers specially formulated solution to clean the deposits and stains from a pH electrode.

    • Available in 500 ml bottles or single use sachets
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    General Purpose Cleaning Solutions

    Maintaining a clean pH electrode is critical to obtaining accurate and reliable pH measurements. General purpose cleaning solution can be used for a variety of applications.Hanna offers specially formulated solution to clean the deposits and stains from a pH electrode.

    • Available in 500 ml bottles or single use sachets
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    Storage Solutions

    All pH electrodes will have a hydrated layer from on the surface of the glass sensing membrane. Maintaining this hydrated is important from a calibration standpoint since the mV response is different from a dry electrode as compared to a hydrated one.

    • Specially formulated to keep the glass hydrated while minimizing organic growth
    • Keeps junction hydrated for fast response
    • Available in 230 and 500 ml bottles
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    Resources

    Check out our Media Library and Knowledge Base pages specifically for hydroponics and hydroponics related products.