Developed for the fishing industry, water managers and river basin authorities

A unique measurement solution
rozpuštěného kyslíku

The first fully autonomous oximeter for long-term, stationary monitoring of oxygen levels, requiring no maintenance.

I want SmonOX

SmonOX is used by

Faculty of Fisheries and Water Management, University of South Bohemia

SRŠ and VOŠ VHE Vodňany

Czech Angling Association

Morava River Basin

Austrian Federal Office for Water Management

Bavarian State Research Institute for Agriculture

How SmonOX works

It floats on the surface and measures the oxygen dissolved in the water, the air temperature and the water temperature

Measurements

SmonOX measures oxygen and temperature 40 cm below the water’s surface at regular intervals, 24/7. The probe cleans itself automatically.

Notice

It sends the readings to the app both day and night and alerts you to low oxygen levels via text message or email.

Operations

The device is powered autonomously by a photovoltaic panel and a modern lithium battery. Active telemetry monitors the condition of the device.

Automation

SmonOx can control aerators and automatic feeding systems.

Oxygen under control

Continuous measurement provides accurate data

  • The concentration of dissolved oxygen is a key factor in the survival and growth of farmed fish. As a result of climate change, oxygen deficits are becoming increasingly common, particularly during the summer months.
  • By monitoring dissolved oxygen levels on an ongoing basis, you can optimise feed rations and water aeration. This enables you to improve the efficiency of feed, electricity, labour and transport resources.
  • In practice, it is not possible to achieve the required frequency and accuracy of dissolved oxygen measurements using portable instruments. Only continuous monitoring of dissolved oxygen, water temperature and air temperature will enable you to manage your fish stocks more effectively.

Results of the SmonOX system testing

The presentation by Dr Jan Másílek and Dr Martin Oberle from the conference in Bavaria (2024) presents the results of testing the SmonOX system for autonomous water quality monitoring. The study confirms its accuracy, reliability and practical application in fish farming.

Download the presentation

Using SmonOX

Simple controls that anyone can master

Starting the equipment

You can activate the device at the touch of a button; you can monitor the readings and set up notifications via the app on your phone or computer.

Status check

SmonOX also transmits information about its precise GPS location, battery charge level and device condition. Its compact size and robust design make it easy to deploy quickly wherever it is needed.

24/7 operation

The device is powered autonomously by a photovoltaic panel and a modern lithium battery. The panel’s output enables the device to operate 24/7, even in poor lighting conditions or when shaded.

Web application

All the necessary information, as well as the device settings, are available both on your PC and on the screen of your mobile device.

References

What our customers say

I know straight away whether we’ll be feeding them or not.

Ever since we started using SmonOX, I know straight away when I wake up in the morning whether we’ll be feeding the animals or not.

Antonín Madzia
Managing Director, Chief Operating Officer
Jistebník Fish Farm Ltd

High fish yields, even in areas where there used to be regular annual fish kills.

I have been using Smonoxy for three years now; they have a wide range of applications. Through continuous measurement of oxygen and temperature, for example, we can verify theories, claims and assumptions regarding fluctuations in oxygen levels in water.

In ponds where, for example, the risk of oxygen depletion is much higher than elsewhere due to the occasional inflow of municipal wastewater, SmonOX helps to regulate the fish feeding regime. This is because fish fed a diet rich in cereals have three times the oxygen requirement. Thanks to SmonOX, relatively high fish yields are now achievable even in places where there used to be regular annual fish deaths due to a lack of oxygen in the water.

Jiří Hronek, Eng.
Operational hydrobiologist
Subject teacher at the Secondary School and Higher Vocational School of Hydrotechnology in Vodňany

We are able to accurately assess the readiness of our broodstock.

Thanks to our detailed records of oxygen levels and water temperature over time, we are able to accurately assess the readiness of our broodstock. We therefore plan the harvest of our broodstock using precise data, rather than relying on personal impressions or the fact that the trees are in bloom.

Martin Růžek, Eng.
ESOX, spol. s r.o. Pike Hatchery.

A reliable and very useful tool for monitoring the oxygen content in water.

The SmonOX oximeter has proven itself under our conditions to be a reliable and very useful tool for monitoring oxygen levels in water. The ability to continuously monitor oxygen concentration is crucial when rearing sensitive species such as zander and trout, particularly for ensuring the fish’s safety and for adjusting feed rations. The SmonOX also plays a significant role in the earthen ponds at the Intensive Aquaculture Laboratory, during the overwintering of zander broodstock and the associated monitoring of oxygen saturation levels in the ponds.

Having used the device at a research institution (the Faculty of Fisheries and Water Protection at the University of South Bohemia), we particularly appreciate the ease with which data can be exported to Excel – which greatly facilitates further processing – as well as the customisable frequency of parameter measurements. In future, it would also be useful to have a function

exporting graphs directly from the application for use in publications (with the source duly cited, of course).

Václav Kučera, Eng.
Scientific, Research and Development Assistant, PhD student
University of South Bohemia in České Budějovice
Faculty of Fisheries and Water Conservation
VÚRH – Intensive Aquaculture Laboratory

Data summaries

Would you like to see real-time data in our app or borrow SmonOX for testing?

  • Please enter the email address you wish to use to log in, and we will contact you.

SmonOX in the media

TV reports

Czech Television ─ Oxygen measurements in the Nové Mlýny reservoir – 24 July 2025 – Events | Czech Television

3SAT.de, 16:42 – Nobel Prize in Physics for Quantum Research – 3sat Media Library

Technical specifications of the SmonOX oximeter

Device specifications

Weight:

14.5 kg

Dimensions:

40 × 60 × 35 cm

Operating temperature range:

0 °C to 50 °C

GPS module:

Yes

Communication interfaces:

NB-IoT

Android/iOS apps, web interface:

Yes

Service and support across the EU:

Yes

A probe for measuring dissolved oxygen

Scope:

0 to 20 mg/l

Accuracy of oxygen measurement:

± 1%

Resolution:

1% or 0.1 mg/l

Temperature compensation:

automatic

Pressure:

max. 7.5 bar

Measurement method

optical measurement using luminescence

Automatic calibration

Yes

The measurement is in progress

40 cm below the water’s surface

Thermometer

Temperature range:

-55°C to +63°C

Accuracy:

± 1°C

Resolution:

0.5°C

Air measured 20 cm above the water’s surface

Water measured 40 cm below the water level

Battery

Battery type:

LiFePO4

Battery voltage:

12 V

Capacity:

6 Ah

Service life:

3,500 charge cycles

Sales office

Get in touch and let’s work together to measure the dissolved oxygen in your water

CZ & SK
Pavel Vinař
+420 777 854 824

DE
Jakub Lauda
+420 776 836 155

PL
Rafał Achinger
+48 509 646 988

AT
Siegfried Unz
+43 664 3456 813

Contact form