Solinst Eureka: Water Probes
Solinst Eureka
2113 Wells Branch Pkwy, Suite 4400
Austin, TX, USA
78728
Tel: +1 512-302-4333
Fax: +1 512-251-6842
email: [email protected]
Water Quality Probes
Solinst Eureka, a global leader in the design and manufacture of multiparmeter water quality sondes.
Solinst Field Services
Safeguard your project’s success and mitigate any potential for downtime or additional costs.

Solinst Eureka Water Quality Sondes
Established in 2002, Solinst Eureka is a global leader in designing and manufacturing multiparameter water quality sondes. We offer the largest selection of sensor technologies for multiprobes in the industry.
In addition to the latest technology for measuring common parameters such as temperature, pH, conductivity, dissolved oxygen, turbidity, and depth, Solinst Eureka provides specialty sensors including PAR (Photosynthetically Active Radiation), Total Dissolved Gas, as well as a long list of fluorometers.
The Trimeter and Manta Probes are multiparameter sondes designed for monitoring water quality in fresh, brackish, and marine environments. All sondes can be used for discrete sampling and profiling or self-powered datalogging. Real-time data is available through cloud-based software when connected to a telemetry station.
Users can operate the Trimeter and Manta Probes with various display options via a direct or Bluetooth® connection. Intuitive control software, compatible with Windows, iOS, and Android™, is included at no additional cost with every probe. Our sondes communicate via RS-232, SDI-12, or MODBUS, allowing flexibility in connecting to various dataloggers and PLCs.
Since Solinst Eureka offers the largest selection of water quality sensor technologies in the industry in addition to standard configurations, each probe may be customized for your specific application. Pick sensors to fully populate larger probes. Add a battery pack to convert a probe to a logging device.
All Trimeter and Manta Probes feature anti-corrosive housings and sensors, robust marine bulkhead connectors, and anti-fouling options. LED status indicators on each sonde provide essential diagnostic information. Each probe comes with an industry-leading 3 year warranty.
Trimeter
Solinst Eureka’s compact, low cost Trimeter is designed for projects that require the same high-quality features of a Manta+ probe, but fewer sensors.
Manta +20
The portable, yet rugged Manta+20 Multi-parameter Sonde is well suited for site-to-site spot checking or profiling, in any type of water. The Manta +20 fits in a backpack too!
Manta +25
Solinst Eureka’s compact Manta+25 Multi-parameter Sonde is an excellent choice when your application calls for turbidity monitoring, but only a few additional sensors.
Manta +30
Solinst Eureka’s Manta+30 Multi-paramater Sonde packs big 4, ORP, depth, and wipered turbidity – plus one ISE sensor, all into one small rugged probe.
Manta +35
Solinst Eureka’s Manta +35 Multi-parameter Sonde accommodates up to 11 different sensors, making it extremely versatile for a wide variety of water quality monitoring applications.
Manta F35
Tired of cleaning fouled sensors? Tired of losing data? Solinst Eureka’s Manta F35 features it’s highly successful Manta+35 Multi-parameter Sonde fitted with a copper nose cone, central wiper blade and more.
Manta +40
Solinst Manta+40, hold more sensors than any multi-parameter probe in the industry. It is ideal for long-term telemetry deployments.
EasyProbe
You’ve never seen this performance at this price in a water-quality monitor.
Water Quality Probe Sensors
The highest quality sensor technology, for unsurpassed accuracy and reliability.
Temperature
Solinst Eureka instruments measure temperature with a thermistor – a small semiconductor whose electrical resistance varies predictably with temperature.
pH
pH is measured with a pH sensor and reference electrode. The pH sensor is a small, glass bulb filled with an electrolyte of known pH.
Turbidity
Turbidity is an indication of the amount of light that will pass through a column of water. Clear waters have low turbidity; waters with high suspended solids have high turbidities.
Transmittance
A transmissometer measures the percentage of light transmitted along a fixed path. Solinst Eureka integrates 3rd party transmissometers, which are mounted externally to the Manta multiprobe.
Dissolved Oxygen
Solinst Eureka optical DO sensors use blue light that is directed to an oxygen-active compound which has been stabilized in an oxygen-permeable polymer. The blue light causes the oxygen-active compound to fluoresce
Conductivity
The easy to clean, flow-through design of the Solinst Eureka conductivity sensor is superior to those with electrodes partially hidden in a recess.
Pressure
An absolute depth sensor (pressure transducer), or vented depth sensor, may be added to any Manta or Trimeter multiprobe, along with other sensors.
Total Dissolved Gas
Solinst Eureka’s TDG sensor is similar to others in the water quality monitoring industry. However, Solinst Eureka is one of the few multiprobe manufacturers that offers a TDG sensor that may also be installed on a multiprobe along with additional sensors, such as dissolved oxygen, turbidity, pH and conductivity.
CO2
Solinst Eureka’s CO₂ (Carbon Dioxide) sensors are the best of their kind for portable, water-quality instruments. Although it is a large sensor, it may be installed in the MantaPlus 40 multiprobe along with other sensors such as dissolved oxygen, pH and conductivity.
ISE Ion-Selective Electrodes
Solinst Eureka’s flowing-junction reference electrode provides better long-term stability than gelled-electrolyte reference electrode. The reference electrode is easily rejuvenated by unscrewing the tip, filling the sensor with fresh electrolyte, and screwing the tip back into place.
PAR
Most PAR (photosynthetically active radiation) sensors when coupled with multiparameter water quality sondes need additional mounting brackets, or cages, to hold the PAR sensor in place. This is not necessary for Solinst Eureka’s PAR sensors, as they are connected to the body of the sonde. For convenience, Solinst Eureka’s PAR sensors may be removed and replaced with a water-proof plug when not in use.

Devices and Apps
Rugged Field Devices and Apps for Water Quality Data Collection
Whether you are configuring or calibrating your multiprobes, collecting discrete data samples, or downloading log files, Eureka has a solution that makes your field work easy! Our display and software options offer extreme flexibility for operating Solinst Eureka’s large family of multiprobes. Direct-connect, or if wireless Bluetooth communication is preferred, select Android or iOS displays for use with our mantaMobile Wireless Bluetooth device.
Wireless mantaMobile
Use the mantaMobile Bluetooth device to operate any of Eureka’s multiprobes with Android or Apple devices.

mantaLink App
Use this app with the mantaMobile wireless Bluetooth device to operate any of Solinst Eureka’s Multiprobes. Available for iOS and Android.

Ruggedized Tablets
Choose iOS or Android device in ruggedized waterproof case to operate Solinst Eureka multiprobes with the mantaMobile – or use your own device.

Manta Control Software
Windows software for PC’s and Laptops to operate any Solinst Eureka multiprobe via a USB connection.

Related Products
Water Level, Temperature & Conductivity Datalogging
The Levelogger 5 LTC measures and logs water level fluctuations, temperature and conductivity. It is programmed to record at intervals as often as 2 seconds. It includes an 8-year battery, memory for 100,000 sets of readings, and comes in 6 pressure ranges. A PFAS-free coating (inside and out) provides superior corrosion and abrasion resistance.
TLC Meter – Measure Accurate Temperature, Level & Conductivity
A TLC Meter provides accurate, stable temperature and conductivity measurements, displayed on a convenient LCD display for easy reading. Static water level and depth of readings are read off Solinst flat tape, which is precisely laser-marked every mm or 1/100 ft. Tape lengths are available to 300 m (1000 ft).