Laboratory-quality pH electrode with common BNC connection for most pH device

  • Robust quality electrode for the JBL CO2 Control unit and other pH measuring and control devices with BNC connection, incl. liquid for calibration of pH sensors
  • Simple connection: connect the electrode via BNC connector to the respective measuring or control device (not supplied)
  • Large protective cap filled with storage solution, plastic shaft and gel filling, suitable for many systems with BNC connector
  • Individually tested with an individual test report
  • Package contents: pH electrode, 2 m cable, 2 suction holders for attachment, 3 cuvettes, 50 ml cylinders: storage solution, distilled water, calibration liquids pH 7.0 and 4.0
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Price: 106,42 €
Recommended retail price incl. VAT
You can find this item in your specialist and online shop
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CO2 cylinder
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Product information

Healthy fish thanks to an ideal pH value
The acidity defines the pH value of the water. It needs to be constantly checked and adjusted as necessary to maintain the health of the fish and plants. The correct pH value depends on the fish stock of the aquarium. The wrong pH value can cause stress and disease.

Easy to connect
Connect the pH electrode with the BNC connection to its corresponding measuring and control device. - RELIABLE: The electrode has been individually tested and documented and needs to be replaced after about 2 years. It comes with a large protective cap, filled with storage solution.

pH electrodes:
Every pH control or measuring device and also the JBL pH-CO2 control unit (JBL PROFLORA CO2 CONTROL) requires a pH electrode (JBL PROFLORA CO2 SENSOR) to measure the pH value of the water. pH electrodes age with time and must be replaced about every 2 years. Every 30-45 days the pH electrode needs to be calibrated so that it continues to show accurate values. During calibration, the functionality of the electrode is also checked so that you know when a new electrode is needed. The pH electrodes do not like the addition of medication to the water and need to be placed in a glass of aquarium water during treatments.

Positioning the pH electrode in the aquarium:
Attach the pH electrode with the suction cups supplied ideally to a dark area in the aquarium with little current. Electrodes easily become algae-ridden in very bright locations.



Art. no.:
EAN Code:
1 kit
Volume packaging:
3.24 l
Gross weight:
622 g
Net weight:
411 g
Weight factor:
Packaging dimensions (l/h/w):
96/201/169 mm


Animal species: Arowana, Axolotl, Barbels, Bettas, Bichirs/reedfish, Blowfish, Catfish, Cichlids (South America), Crayfish, Danions, Discus, Dwarf shrimps, Flowerhorn, Goldfish, Gouramis, Guppy, Juvenile fish, Killifish, Livebearers, Loaches, Panchaxes, Rainbowfish, Snails, Spiny eels, Tetra, Veiltails, freshwater butterflyfish
Animal size: For all animal sizes
Animal age group: All aquarium fish
Volume habitat: For all aquariums
Material: Plastic (PVC), plastic (PE), plastic (ABS), metal (copper)
Colour: white / transparent / black

Electronic label / illuminant

Mercury: No
Dimmable: No

Technical Data

Height:12 mm
Length:160 mm
Width:16 mm
May the JBL PROFLORA CO2 products only be used for the aquarium?

Yes, the JBL PROFLORA CO2 products are designed exclusively for use in the aquarium. The gas contained promotes plant growth and works with fine precision so that even the smallest quantities can be supplied to the aquarium. Constant operation and the safety of the fish are thus guaranteed.

What does the MIN date on the packaging mean?

All pH sensors (electrodes) are wear parts and are subject to natural ageing. JBL grants a 6-month guarantee if the sensor is put into operation before the stated MIN date. The purchase receipt serves as proof.

Is my sensor going to expire when we reach the date on the packaging?

No, don't worry. The MIN date on the packaging is not a BBD (best before date), but the date of the latest intial operation to guarantee 6 months warranty and 1 year operation. This information can also be found on the product packaging. Everything is therefore in order.

What does the message INSTAB mean?

The message INSTAB indicates: instable sensor voltage: the sensor tip is dirty, the electrolyte has leaked from the sensor, the sensor tip is damaged.

Remedy: Clean the sensor head (see the respective instruction), put the sensor into the storage solution for 24 hours and repeat the calibration. If this does not work the sensor is defective and should be replaced.

What deviations during the calibration are usual and how are they connected to the temperature?

It is difficult to give a precise answer without information about the sensor, particularly the age of the sensor. Good sensors have deviations in the range from 0.02 to 0.05 pH levels when calibrating.

The input voltage differs for each sensor, as each sensor has its own individual properties. For the majority of our sensors, it is between -30 and +30 mV at pH 7.

Both input voltages (pH 7 and pH 4) are important when assessing the quality of a sensor. The greater the difference between these two values, the better the sensor and the precision of the measurement and control. The differences should be over 140-150 mV.

The temperature sensor should always be used during calibration. The pH level varies according to temperature, so that it is always best to measure the pH level with temperature compensation. The deviation is between 20 and 30 °C, 0.17 pH levels, and the relationship is nonlinear.

Show more FAQs ...
Blog (opinions & experiences)

Why is CO2 such a good help when combating algae?

Algae are plants, but only very simple Algae are plants, but only very simple ones. CO2 fertilisation promotes the growth of the more complex plants and algae have no chance against them!

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Perfect plant growth in your aquarium with the JBL PROFLORA CO2 System

Carbon dioxide (CO2) is the main food for your aquarium plants. With the help of a CO2 system you supply your plants with enough CO2 so that they can grow vigorously and healthily.

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CO2, also called carbon dioxide, is the main nutrient for all plants.

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The JBL Autumn Competition 2021

Falling golden leaves are attractive, as long as it’s not your aquarium plants losing their leaves. In the tank, you want your plants shining in rich shades of green and red. We can help you achieve this.

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Reference guide (Themeworld)

Plant growth

Are your aquarium plants growing as well you want? Here’s how to achieve perfect plant growth

Reducing problematic water values

How to lower critical water values.

Deficiency symptoms

Here’s how to prevent deficiency symptoms in fish and plants

Algae control

Here’s how to combat algae successfully and lastingly.

Plant care

What maintenance measures do your aquarium plants need?

Daily care

How much daily or weekly care is involved? What are the basic maintenance measures for your aquarium?


Why is CO2 so important for plant care? What benefits does CO2 fertilisation provide?


Why do aquarium plants need to be fertilised?

Plant species

Which plant species suit your aquarium? What demands do the individual species have?

Installation technical items

How and where in the aquarium do you fix and install technical items? Tips and tricks for the installation of all technical aquarium products


Which aquarium plants are best? What’s the best way to plant them?

Marine water - technical items

What is the difference between a marine and a freshwater aquarium? What is especially needed for a marine aquarium?

CO2 plant fertilisation

How important is CO2 plant fertilisation? Why do your plants need additional CO2? How does a CO2 system work?

The marine aquarium

Holiday at the coral reef - in your own living room! Marine aquariums are the most exciting branch of aquatics

Biotope (habitat) aquarium types

A real piece of the Amazon or, with the Congo, a piece of the heart of Africa. A habitat (biotope) aquarium is a challenge. Can you emulate nature?

Aquascaping aquarium type JBL Dreamscape®

Mountains, valleys, meadows and fish! Create your dreamlike landscape under water with the Dreamscape® aquarium

Jungle aquarium type JBL Rio Pantanal®

A bit of jungle river in your living room. Lively underwater action! No problem with the JBL Rio Pantanal® aquarium

Rocky reef aquarium type JBL Malawi Rocks®

The fish of Lake Malawi are as colourful as the fish in the coral reefs. This aquarium brings a bit of freshwater reef into your living room

Goldfish aquarium type JBL Goldfish Paradise®

Lively goldfish in the aquarium enhance any room perfectly! Invite some new flatmates into your home with this goldfish aquarium.


safety instructions

  • safety instruction for accessories
    • Filename:
spare parts
Customer reviews


Overall rating: 5.0
5 public review(s) for this product.

0 Reviews

5 more reviews in other languages

5 Reviews in other languages

A. Wendt - German

Sehr gute Haltbarkeit ! Bei mir über ein Jahr im Gebrauch und immer noch im sehr guten Toleranzbereich.

LadyDiscus - Polish

kocham ! najlepszy!bardzo bardzo polecam

J. Le lous - French

super produit

Facile d'utilisation et tres precis

je recomende ce produit a 100%

great product

easy to use and very precise

I recommend this product 100%

H. PEKTAŞ - Turkish

Beste Qualität 👍

skalar1987 - German

Habe diese Sonde zu meiner PH Control Anlage benötigt. Sehr einfach zu kalibrieren uns auch die Messung ist sehr genau. Super👍

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