6-Series Multiparameter Instruments

YSI 6-Series Multiparameter Sondes

Designed for in situ monitoring and profiling, and ideal for long-term deployments requiring the most complete water quality data record.


CastAway CTD front and back views.

YSI CastAway™ CTD with GPS

The YSI Castaway is the worlds first CTD to provide instantaneous profiles for temperature, conductivity, salinity, depth and speed down to 100m.


SonTek M9

SonTek RiverSurveyor S5 and M9 Acoustic Doppler Current Meter

The RiverSurveyor M9 and S5 are the next generation of acoustic doppler for measuring open channel flow. Using SonTek’s exclusive multiple acoustic frequencies allows continuous shallow-to-deep discharge measurements. A range of new technologies means you can focus on the measurement, not the instrument setup. In addition to this the system has a vertical beam for precise channel definition and it's all designed to work intuitively



SonTek Argonaut-SL Side-Looker

Designed with the need for an easy way to measure water velocity, level and calculate flow / discharge in open channels, the Argonaut-SL has earned worldwide acceptance as a long-term monitoring solution. Fully featured with accessories, mounting options, software, and a variety of integration formats, the Argonaut-SL fits your application in the way you need it to.


Torrent Board

SonTek Torrent Board for ADCP measurements

High speed, low drag ADP surfboard for SonTek S5/M9 RiverSurveyor systems.


Cable Chimp

Cable Chimp II

The Cable Chimp II is a great choice when choosing a remotely-operated cableway vechicle. High data-quality stream gauging requires slow, even and repeatable towing, making the Cable Chimp II the best and most reliable way to consistently collect high data-quality from small tethered boats


SonTek FlowTracker with Smart QC

SonTek FlowTracker Handheld Flow Meter

The Flowtracker has been designed with the field user in mind, this handheld Acoustic Doppler Velocimeter (ADV) measures 2D or 3D currents, attaches easily to wading rods, and features an automatic discharge computation using a variety of international methods, including ISO and USGS standards. At the end of the data run, just press a button and the FlowTracker calculates the discharge for you!


ProPlus with Quatro attachment

YSI ProPlus Quatro Multiparameter

Leading handheld water quality meter in the UK certified with MCERTS the YSI Professional Plus Quatro is a field rugged meter capable of measuring temperature, conductivity, salinity, pH and dissolved oxygen plus one of redox, ammonium, nitrate or chloride. Applications include surface and groundwater monitoring.


YSI Professional Plus Instrument in the Lab with Lab-Grade pH Sensor

YSI ProPlus Multiparameter

The YSI Professional Plus is a universal handheld multiparameter meter providing extreme flexibility for the measurement of a variety of combinations for dissolved oxygen, conductivity, specific conductance, salinity, resistivity, total dissolved solids (TDS), pH, ORP, pH/ORP combination, ammonium (ammonia), nitrate, chloride and temperature. Also a very powerful lab instrument for BODs, pH and ORP.


YSI ProODO Optical Dissolved Oxygen Instrument

YSI ProODO™ Handheld Optical Dissolved Oxygen Meter

The new ProODO offers traditional YSI quality with the latest luminescent optical dissolved oxygen  technology. The ProODO utilises a proven digital sensor technology to offer the most accurate dissolved oxygen data from a portable field meter.


Multi 3430

WTW Multi 3410 Optical Dissolved Oxygen Meter

The Multi 3410 is the top of the range handheld meter for the measurement of dissolved oxygen in wastewater applications. The 3410 uses IDS (Intelligent Digital Sensors) technology for the most precise and flexible measurements.


Multiline 3430

WTW Multi 3430 Multiparameter Water Quality Meter

The Multi 3430 portable meters are precise measuring instruments for mobile applications in the field and operations where more than one parameter has to be measured. This meter accepts different versions of intelligent digital IDS sensors and  well as conventional electrodes.


EcoMapper AUV

YSI EcoMapper AUV

The EcoMapper is a unique AUV (autonomous underwater vehicle) designed to create high-resolution maps of water quality and bathymetry.



YSI PeliNet Portable Telemetry

PeliNet is a portable, instantly deployable, telemetry solution for short term and emergency monitoring applications. PeliNet is based on YSI's Econet system allowing the user to make instant, meaningful decisions without the need for additional costly resources or time-consuming trips to the field.



YSI EMM700 Data Buoy Platform

The EMM700 buoy is a medium-sized platform suitable for near-shore and inland water applications.  It is designed around logging, sensors, and remote telemetry.  The bay buoy platform will deliver data for years, making it suitable for research and long-term monitoring applications.


650MDS - Multiparameter Display System

YSI 650MDS Data Display / Logger

The YSI 650 is a field rugged display / datalogger capable of communicating with any YSI 6-Series multiparameter instrument


Cyclops C7

Oil-in-Water Sensor Kit

Its now possible to expand your water quality monitoring to include hydrocarbons or oil with the YSI Sensor Adapter. The YSI Sensor Adapter expands water quality monitoring to include third-party analog output sensors allowing the 6 Series sondes to measure hydrocarbons and other parameters.


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We have a large pool of water quality and hydrology instruments available to you for rental for a variety of applications. From groundwater purging to long term unattended datalogging and more - View our online rental brochure on the left or browse available products below. Rentals are available in the UK only.


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Want to return a product for repair? Here you’ll find instructions on how to send in your instruments.


We have a large pool of water quality and hydrology instruments available to you for rental.