Wireless glass-free pH measurement.

pH is a critical parameter in a multitude of areas, including research, agriculture, water environment, food, industry and more. Sentron has developed a comprehensive line of wireless glass-free probes for pH measurements on your own phone or tablet. Sentron’s glass-free ISFET pH sensor technology offers accurate and reliable pH measurements for demanding applications.

Glass free pH measurement

pH is a critical parameter in a multitude of areas, including research, agriculture, water environment, food, industry and more. Sentron has developed a comprehensive line of wireless high quality probes for glass-free pH measurements. Sentron’s ISFET pH sensor technology offers accurate and reliable pH measurements for demanding applications.


Whether you run a large-scale laboratory or whether you are in a classroom, the safety and integrity of your studies and instrumentation is of the utmost importance. The Sentron laboratory glass-free ISFET pH probe delivers precision while offering simplicity and versatility.
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Agriculture varies from the home gardener to horticulture with commercial greenhouses. They all have a common thread: they sustain the world. Testing, monitoring and adjusting growth parameters help to maximize efficiency, quality and production. The Sentron glass-free ISFET pH probes are a good solution for this. 
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In many industries, pH is a critical parameter. These industries include food (e.g. meat, dairy beverage, wine and beer), pharmacy, textile and water treatment. pH testing during the manufacturing process can enhance production usability, accuracy and excellence.
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Take the lab with you. Our wireless handheld pH probe with glass-free ISFET pH technology makes it ideal for measuring the pH of water in tougher settings. Take direct pH and temperature measurements for water quality monitoring using your smartphone or tablet.
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Durable, accurate, wireless

Wireless and durably interchangeable, our premium pH probe enables you to monitor this essential parameter in whatever application, whenever you want and wherever you are.

Sentron app
Wireless Bluetooth pH measurement on your own phone or tablet. Sentron provides the free app, as well as dedicated Samsung phones and tablets.
Sentron app
Cloud-based free application for setting configurations, calibrating, acquiring, visualizing, storing and exporting all your measurement data.
Sentron app
Unlimited number of connected probes for simultaneous wireless pH measurements.
Sentron app
Need for simultaneous multiparameter measurements? Follow us! Soon we will release our innovative multi-sensor probe, connectable to the Sentron App for multiple parameter measurements and visualization.
Sentron app
Intuitive app that guides you through calibration and measurement settings.

Complete control from the Sentron app.

What’s next?

By taking a serious look at all applications, we keep entering into new innovations in our semiconductor production facility. Soon we will launch sensors for EC and ORP, with which great multisensor solutions for e.g. water monitoring can be provided. Additionally, we  continue our R&D on ion-selective sensors.

For all applications we constantly seek innovations in our semiconductor factory. Soon we will launch sensors for EC and ORP. These can provide great multi-sensor solutions for, e.g., water monitoring. Imagine: all parameters to be monitored using one and the same probe! Additionally, we’re looking forward to finalize the R&D on ion-selective sensors.

The EC is the measure of a material’s ability to allow the transport of an electric charge. This knowledge is important for water-quality monitoring in public water supplies, in hospitals, in boiler water and in industries which depend on water quality such as horticulture and breweries.

Low conductivities are expected for pure water applications like aquaria, household, drinking water and rivers. On the other side, high conductivities are expected for industries like irrigation and greenhouses. 

The ORP is the measure of the tendency of aqueous solutions, or any other chemical species, to either acquire electrons from an electrode and be reduced thereby, or to lose electrons to an electrode and be oxidized thereby. This knowledge is important for water-quality monitoring in aquaria, swimming pools, as well as environmental and wastewater sampling. E.g. ORP is an indicator of micro-organism inactivation in a swimming pool or spa pool.

High ORP values (positive potentials) are expected for aerated surface water, rivers, lakes, oceans and rainwater. Low ORP values (negative potentials) are expected in places with limitations in air supply such as submerged soils, swamps and marine sediments.

Sentron is working on innovative developments on ion-selective sensors that have a membrane mixture suitable for detection of different ions based on the ISFET technology. Selectivity is based on proprietary modifications with several polymer matrix configurations. Nitrate (NO3), Ammonium (NH4+) and Potassium (K+) are currently in development.

It’s all about sensors

Besides the wireless and durable pH probe product line, you can also reach out to us for any customized sensor integration into your own product.

The non-glass ISFET (Ion Sensitive Field Effect Transistor) pH sensor is one of the sensors that we produce in our semiconductor production facility. It is robust and does not require wet storage, which makes it well suited for, e.g., agriculture, water environment, food and other industrial applications. Our ISFET assemblies are proven successful in the market in FDA approved and CE certificated medical devices for the medical application in gastro-enterology.
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Contract development

In our facility we also produce the advanced miniature piezo resistive sensor that is equipped with a full Wheatstone bridge for differential pressure measurements: thus, no influence due to atmospheric changes. The narrow dimensions of this pressure sensor make it ideally suited for medical applications. Our pressure sensor assemblies are already on the market in medical devices for cardiology, as well as for neurology and urology catheters.

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Contract development

Frequently Asked Questions

Thanks to the ISFET technology the pH sensors are robust and can be stored dry. This has a great benefit for applications like water quality measurements in stream beds and tidal areas, where the water level changes in time and the probe will occasionally be above the water level.

The glass-free approach makes the pH also available for inline food processes and medical applications like gastro-enterology, for which any glass splinter could be fatal.

The new product line is a wireless product line. No cable and thus more flexibility. No limitation of 1 probe per meter at a maximum 1.5 meters distance anymore! The Bluetooth connection enables you to leave several meters between the mobile and the probe. Multiple probes can be connected and read out simultaneously. Additionally, the features of your phone can be used: GPS, social media, cloud use, etc.

Furthermore, we’ll release a multi-sensor on the market in the near future. This probe for pH, EC and ORP can be added up to the number of probes connected to your mobile device.

The connection between the probe and the mobile phone is dependent on the Bluetooth signal. We have used a powerful approach for this, enabling a distance of maximum 50 meters through the air. 

No, for the interval measurement it is not required. Once the interval measurement has started, it will continue even when your mobile device is out of Bluetooth range of the probe. Data will be stored in the probe and downloaded to the app as soon as your mobile device is in reach of the probe. One interval can have up to 10,000 readings.

Let’s get connected and see whether we have a match. Please refer to info@sentron.nl and we’ll contact you as soon as possible.

Besides the standard product-line, we also provide contract development and contract manufacturing of sensor assemblies. More information on contract development or contract manufacturing can be found at Sensor Integration Services.

While the SI meters themselves are out of stock, the wired probes for these meters can still be purchased at our webshop. However, we strongly suggest to take a look at the new, wireless, product line as it has several benefits and great features compared to the cabled pH product line.