Calibration Fluids for pH and EC Meters

Milwaukee pH 7.01 20ml buffer solution / calibration liquid for pH measuring instruments.

• Accuracy: ±0.01 pH
• value: 7.01 pH at 25°C
• volume: 20 ml
• single-use

Milwaukee pH 4.01 20ml buffered solution / calibration liquid for pH meters.

• Accuracy: ±0.01 pH
• value: 4.01 pH at 25°C
• volume: 20 ml
• single-use

Milwaukee 1413 µS/cm Conductivity Calibration Solution 20ml is a buffered solution/calibration liquid for instruments measuring electrical conductivity (EC).

• accuracy: ±0.01 EC
• value: 1413 µS/cm at 25°C\n
• volume: 20 ml
• single-use

Extend the life of your pH meter, sensor, probe or ORP electrode with Milwaukee MA9015 Storage Solution for pH / ORP Electrodes 230ml!

To obtain fast and accurate measurements of the pH and redox potential of your solutions, you must not let your sensor dry out! Proper storage of your pH sensor in solution keeps the glass membrane well hydrated, which supports correct operation and ensures accurate readings.

• storage solution
• volume: 230ml

Milwaukee Electrode Rinse Solution 20ml is ideal for rinsing your electrode between immersion in different calibration fluids, thereby preventing them from mixing. This rinse solution is also ideal for removing accumulated deposits on the probe or cap caused by evaporation of the storage solution. Although the buildup of these deposits is normal, they must always be removed before measurement or calibration!

• Does not replace cleaning or storage solutions!
• Extends the life of your electrode!
• single-use

Milwaukee pH 10.01 20ml buffered solution / calibration liquid for pH meters.

• Accuracy: ±0.01 pH
• Value: 10.01 pH at 25°C
• volume: 20 ml
• single-use

Milwaukee 12880 µS/cm Conductivity Calibration Solution 20ml is a buffered solution / calibration liquid for instruments measuring electrical conductivity (EC).

• accuracy: ±0.01 EC
• value: 12880 µS/cm at 25°C
• volume: 20 ml
• single-use

Milwaukee MA9016 Cleaning Solution for pH / ORP Electrodes 230ml is specially designed to improve and extend the life of the pH sensors and ORP electrodes in your instruments! The accuracy and speed of measurements depend on whether the tip of the pH sensor or the ORP electrode is clean!

• electrode cleaning solution
• volume: 230 ml

Directions for use:

1. Open the bottle and fill a cup or container so that the level covers the sensor and electrode.
2. Soak for 15 to 20 minutes!
3. Soak in MA9015 storage solution for at least 2 hours!

The reusable Bluelab pH 7.0 Calibration Solution 250ml (pH) is a high-quality calibration liquid for single-use pH sensors/probes. Bluelab calibration solutions are essential when using all Bluelab measuring instruments. They are produced specifically for Bluelab products and meet high laboratory standards, helping ensure that your Bluelab products remain accurate and last longer.

• Accuracy: ±0.01 pH
• Value: 4.0 pH at 25°C
• Volume: 250 ml
• for repeated calibration

The Bluelab pH 7.0 Calibration Solution 18ml calibration solution (pH) is a high-quality, single-use calibration liquid for pH sensors/probes. Bluelab calibration liquids are essential when working with all Bluelab measuring instruments. Bluelab calibration liquids are made specifically for Bluelab products and meet high laboratory standards to ensure that your Bluelab products last longer and remain accurate.

• Accuracy: ±0.01 pH
• value: 7.0 pH at 25°C
• volume: 18 ml
• single-use

The Bluelab pH 4.0 Calibration Solution 250ml reusable pH calibration solution is a high-quality calibration liquid for single-use pH sensors/probes. Bluelab calibration solutions are essential when using all Bluelab measuring instruments. Bluelab calibration solutions are manufactured specifically for Bluelab products and meet high laboratory standards to ensure that your Bluelab products last longer and remain accurate.

• Accuracy: ±0.01 pH
• value: 4.0 pH at 25°C
• volume: 250 ml
• for repeated calibration

Bluelab 2.77 EC Conductivity Standard Solution 250ml is a high-quality solution for calibrating EC meters (electrical conductivity meters). Bluelab calibration fluids are essential when working with all Bluelab measuring instruments. Bluelab calibration fluids are specially manufactured for Bluelab products and meet high laboratory standards to ensure that your Bluelab products last longer and remain accurate.

• accuracy: ±0.01 EC
• value: 2.77 µS/cm at 25°C
• volume: 250 ml
• for repeated calibration

Essentials CF Standard 2.8ms 30ml is a buffered solution / calibration fluid for instruments that measure electrical conductivity (EC).

• accuracy: ±0.01 EC
• value: 2.8 µS/cm at 25°C
• volume: 30 ml
• single-use

Bluelab pH 4.0 Calibration Solution 18ml is a high-quality single-use calibration liquid for pH sensors / probes. Bluelab calibration solutions are essential when working with all Bluelab measuring instruments. Bluelab calibration solutions are manufactured specifically for Bluelab products and meet high laboratory standards to ensure that your Bluelab products last longer and remain accurate.

• Accuracy: ±0.01 pH
• value: 4.0 pH at 25°C
• volume: 18 ml
• single-use

Bluelab KCl is a specialised storage liquid for pH probes and electrodes that prevents the sensitive tip from drying out. It ensures proper probe hydration and maintains measurement accuracy. Compatible with: B

• pH pen
• Bluelab Soil pH p
en
• Bluelab pH
• Meter Bluelab

pH Probe Product type: storage solution for pH probes and electrodes. Com

 potassium chloride (KCl) — the same type of solution as the internal electrolyte in pH probes, preventing damage and dry

out V

 100 ml Function: keeps the pH probe hydrated, extending its life and ensuring a rapid response

during measurement Compatibility: suitable for all Bluelab pH meters, probes and pens, as well as other

compatible

• devices. Advantages: prevents
• the electrode from drying ou
t
• extends the life of the pH probe

maintains accurate and

stable measurements Recommendations for use: Probe storage: add a few drops to the pH probe cap and close it to

keep the tip constantly moist. Recovery: if the probe has dried out, immerse it in KCl solution

for 24 hours before reusing it Maintenance: use monthly to maintain measurement accuracy

and speed. Product storage: store in a cool, dry place away from direct light.

Bluelab Probe Care Kit – pH & Conductivity is a kit containing everything needed to clean, hydrate and calibrate your pH meter probe, as well as clean and test your EC meter probe (electrical conductivity meter):

• Instructions on how to care for the probes of your meters
• 2 x Bluelab pH 7.0 Calibration Solution - Sachet 20ml
• 2 x Bluelab pH 4.0 Calibration Solution - Sachet 20ml
• 2 x Bluelab pH Probe KCl Storage Solution - Sachet 20ml for single use
• 2 x Bluelab 2.77 EC Conductivity Standard Solution Sachet 20 ml for single use
• pH probe cleaning solution
• EC probe cleaning solution
• pH probe cleaning tool
• EC probe cleaning tool

1. Your instruments' measurements are only as accurate as their probes are clean. Accurate measurements simplify crop growing and ensure improved growth.
2. Proper maintenance and storage of your probes ensure the most accurate measurements possible and maximise their lifespan. The probe surface is where the instrument measures the solution. If the probe is uncleaned and contaminated, measurements may be inaccurate. Like a car windscreen: if it is dirty, you will not be able to see the road! If the probe is contaminated, it cannot take accurate measurements.
3. Tip ... if the measured conductivity levels are too low, the probe needs cleaning.
4. The pH probe must be kept wet at all times for optimum performance and a long life!

🔹 pH 7.01 Calibration Solution - 300 ml is specially formulated for calibrating pH meters, ensuring accurate and precise measurements. With its stable pH level of 4.01 at 25°C, it is ideal for checking and adjusting measuring instruments used in hydroponics, aquariums, laboratories, and other applications.

🔹 Detailed specifications:

• Volume: 300 ml
• pH value: 7.01 at 25°C
• Application: Calibration of pH meters
• Composition: Complies with international standards for calibration solutions
• Manufacturer: Wather Masters

🔹 Recommendations and instructions for use:

1. Pour a small amount of the solution into a clean container.
2. Immerse the pH meter electrode in the solution.
3. Calibrate according to the manufacturer's instructions for your pH meter.
4. After use, discard the used solution and do not return it to the original packaging to avoid contamination.

✅ Benefits of use:

• Accuracy: Ensures precise pH measurements.
• Easy to use: Convenient for use both in laboratory and field conditions.
• Compatibility: Suitable for most pH meters on the market.
• Durability: Stable pH value, ensuring reliable calibration of your instruments.

Milwaukee pH 7.01 230 ml buffered solution / liquid for calibrating pH measuring instruments. Calibrating your pH meter is a simple procedure for optimum performance and should be carried out whenever your instrument's readings appear questionable. Calibration should be carried out at least once a month! 

• accuracy: ±0.01 pH
• value: 7.01 pH at 25°C
• volume: 230 ml

Milwaukee calibration liquids are designed to help you achieve reliable and repeatable pH measurements while extending the life of your instrument.

Bluelab Probe Care Kit - pH is a kit containing everything needed to clean, hydrate and calibrate your pH meter probe:

• Instructions on how to care for your probe
• 2 x Bluelab pH 7.0 Calibration Solution - Sachet 20ml
• 2 x Bluelab pH 4.0 Calibration Solution - Sachet 20ml
• 2 x Bluelab pH Probe KCl Storage Solution - Sachet 20ml
• 3 plastic cups
• Probe cleaning solution
• Bluelab toothbrush (probe cleaning tool)

1. Your pH meter is only as accurate as its probe is clean. Accurate measurements simplify crop growing and ensure improved growth.
2. Cleaning and correctly storing your pH probe ensure the most accurate measurements possible and maximise the probe’s life.
3. The probe surface is where the instrument measures the solution/soil. If the probe is unclean and contaminated, measurements may be inaccurate. Like a car windscreen, if it is dirty, you cannot see the road. If the probe is contaminated, it cannot measure the concentration of the solution/soil.
4. The pH probe must be kept wet at all times for optimum performance and a long life!

Milwaukee pH 4.01 230 ml buffered solution / liquid for calibrating pH meters. Calibrating your pH meter is a simple procedure for optimum performance and should be performed whenever your meter's readings appear questionable. Calibration should be carried out at least once a month!

• accuracy: ±0.01 pH
• value: 4.01 pH at 25°C
• volume: 230 ml

Milwaukee calibration liquids are designed to help you achieve reliable and repeatable pH measurements while extending the life of your instrument.

Growth Technology pH Probe Refill & Storage Solution is a specialised solution for maintaining, refilling and storing pH electrodes with liquid electrolyte. Regular use of the solution helps maintain accurate measurements, extends electrode life and prevents the sensitive measuring membrane from drying out.

Every pH electrode needs proper maintenance to provide accurate and reliable measurements. Growth Technology pH Probe Refill & Storage Solution is specially developed for pH probes and electrodes with liquid electrolyte, allowing both replenishment of the internal solution and proper storage between measurements.

During normal use, the electrolyte level in pH electrodes gradually decreases. Regular topping up with a suitable solution helps maintain correct electrode operation and ensures consistent measurement accuracy.

In addition to being a refill solution, the product also serves as a pH probe storage solution. When the electrode is not in use, its glass tip should remain immersed in a suitable liquid. This prevents the membrane from drying out and significantly extends the measuring instrument's service life.

The formula contains diluted potassium chloride (KCl), which maintains the electrode in optimal condition and helps preserve its sensitivity and accuracy even during prolonged use.

Technical specifications

✔️ Manufacturer: Growth Technology

✔️ Product type: pH probe refill and storage solution

✔️ Pack size: 300 ml

✔️ Main ingredient: Diluted potassium chloride (KCl)

✔️ Suitable for pH electrodes with liquid electrolyte

✔️ Maintains the correct electrolyte level

✔️ Prevents the electrode from drying out

✔️ Improves measurement accuracy

✔️ Extends pH probe life

✔️ Suitable for laboratory, hydroponic and horticultural applications

❌ Not suitable for gel-filled probes

Benefits

✔️ Maintains maximum pH-measurement accuracy

✔️ Protects electrodes from drying out

✔️ Extends probe service life

✔️ Suitable for both storage and refilling

✔️ Reduces the risk of incorrect readings

✔️ Easy to use

✔️ Suitable for all hydroponic and gardening systems using pH meters with liquid electrolyte

Application

Suitable for:

• pH meters

• pH electrodes with liquid electrolyte

📋 Instructions for use

For storage: Immerse the pH electrode tip in a small amount of solution when the device is not in use. This keeps the membrane moist and prevents loss of accuracy.

For refilling: Follow your pH meter manufacturer’s instructions and top up the electrolyte as needed to maintain the correct level in the electrode.

💡 Urban Botaniks tip: Never store a pH electrode in distilled or reverse-osmosis water. This can damage the membrane and significantly reduce measurement accuracy. For maximum probe life, always use a specialised storage solution such as Growth Technology pH Probe Refill & Storage Solution. 🧪🌱

Bluelab pH Probe Storage Cap. It is essential to replace the storage cap on the tip of the pH probe immediately after use and while it is stored. "If it dries out, it dies!". Keep the tip of the pH probe wet by ensuring there is enough Bluelab pH Probe KCl Storage Solution to cover it.

Buffer solution for calibrating pH measuring devices – pens, monitors and controllers.

• preset accurate and stable pH value: 4.0
• suitable for Bluelab®
• volume: 300 ml

pH measuring devices must be calibrated regularly. Follow the instructions supplied with the device.

For 2-point calibration, use pH Buffer 4 and pH Buffer 7, unless the instructions state otherwise. Store the probe in Growth Technology pH probe storage solution.

Storage conditions:

1. Store in a cool place!
2. Keep out of reach of children!

🔹 pH Calibration Solution 4.01 - 300 ml is specially formulated for calibrating pH meters, ensuring accurate and precise measurements. With its stable pH level of 4.01 at 25°C, it is ideal for checking and adjusting measuring instruments used in hydroponics, aquariums, laboratories, and other applications.

🔹 Detailed specifications:

• Volume: 300 ml
• pH value: 4.01 at 25°C
• Application: Calibration of pH meters
• Composition: Complies with international standards for calibration solutions
• Manufacturer: Wather Masters

🔹 Recommendations and instructions for use:

1. Pour a small amount of the solution into a clean container.
2. Immerse the pH meter electrode in the solution.
3. Perform calibration according to the manufacturer's instructions for your pH meter.
4. After use, discard the used solution and do not return it to the original container to avoid contamination.

✅ Benefits of use:

• Accuracy: Provides precise pH measurements.
• Easy to use: Convenient for use in both laboratory and field conditions.
• Compatibility: Suitable for most pH meters on the market.
• Durability: Stable pH value, ensuring reliable calibration of your instruments. 

Bluelab Probe Care Kit - Conductivity is a kit containing everything needed to clean and test the probe of your EC meter (a device for measuring electrical conductivity):

• Instructions on how to care for your probe
• 2 x Bluelab 2.77 EC Conductivity Standard Solution Sachet 20 ml for single use
• Plastic cup
• Probe cleaning solution
• Probe cleaning tool

The measurements of your EC meter are only as accurate as its probe is clean. Accurate measurements simplify crop growing and ensure improved growth.
Proper maintenance of the EC instrument's probe ensures the maximum possible extension of both its service life and that of the instrument.
The probe surface is where the instrument measures the solution. If the probe is unclean and contaminated, measurements may be inaccurate. Like a car windscreen: if it is dirty, you will not be able to see the road! If the probe is contaminated, it cannot measure the concentration of the solution.
Tip ... if the measured electrical conductivity levels are too low, the probe needs cleaning.

Milwaukee MA9069 5000 µS/cm Conductivity Solution 230ml is a buffered solution / calibration liquid for electrical conductivity (EC) meters.

• accuracy: ±0.01 EC
• value: 5000 µS/cm at 25°C
• volume: 230 ml
• for repeated calibration

Buffer solution for calibrating pH-measuring devices - pens, monitors and controllers.

• pre-set, accurate and stable pH value: 7.0
• suitable for Bluelab®
• volume: 300 ml

pH measuring devices must be calibrated regularly. Follow the instructions supplied with the device.

For 2-point calibration, use pH Buffer 4 and pH Buffer 7, unless the instructions state otherwise. Store the probe in Growth Technology pH probe storage solution.

Storage conditions:

1. Store in a cool place!
2. Keep out of reach of children!

Bluelab pH Probe KCl Storage Solution 250ml is the ideal solution for storing and hydrating your Bluelab pH probes or pens. Every self-respecting gardener should have it if they want to extend the life of these sensitive glass instruments as much as possible; they naturally age with daily use. The storage solution is suitable for / compatible with:

• Bluelab pH pen
• Bluelab Soil pH pen
• Bluelab pH Meter
• Bluelab pH Probe

Instructions for use:

• Add Bluelab pH Probe KCl Storage Solution to the cap of the pH pen / probe for storage after use and hydrate it with the solution once a month.

Bluelab EC 2.77 is a calibration solution designed for checking and setting EC (electrical conductivity) meters and probes. The single-use 18 ml dose ensures a fresh, accurate solution every time for reliable measurements. Suitable for hydroponics, coco and soil growing.

Value: 2.77 EC (mS/cm) — standard reference value for calibrating EC instruments.

Volume: 18 ml — single-use sachet format, ensuring a clean, unchanged solution with every use. Do not reuse, as the value changes when the solution stands!

Function: used for calibrating, testing and checking EC probes and instruments, ensuring accurate results when measuring nutrient solutions.

Compatibility: suitable for all Bluelab EC instruments and other compatible measuring devices.

Application: used in hydroponics, greenhouses and for monitoring plant nutrient solutions.

Recommendations for use:

Calibration: immerse the probe in the solution and follow the instrument’s calibration instructions.

Accuracy: always use fresh liquid — single-use sachets guarantee the best results.

Cleaning: before calibration, rinse the probe with clean water to avoid contaminating the solution.

Storage: store in a cool, dry place away from direct light and heat to preserve product quality.

Calibration solution for conductivity (EC) measuring devices – pens, monitors and controllers.

• preset EC value: 1.413 mS/cm
• suitable for Bluelab®
• volume: 300 ml

Electrical conductivity (EC) meters must be calibrated regularly. Follow the instructions supplied with the meter. After use, always rinse the probe with clean water and dry it with a tissue.
The Bluelab Truncheon EC meter does not require calibration! However, it should be checked regularly with this solution. If the reading is low or different from 2.76 mS/cm, the probe tip must be cleaned carefully; also check the batteries.

Storage conditions:

1. Store in a cool place!
2. Keep out of reach of children!