YSI Water Quality Testing Products
FarrWest Environmental Supply offers you Water Quality Instruments from YSI Instruments for sale or rent. We provide competitive pricing, training, service and support on all YSI products that we sell, from the popular YSI Pro Series Pro Plus to the YSI EcoSense EC300.
(210) 566-1857 email: sales@farrwestenv.com
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Industry Events:

Texas Commission on Environmental Quality - Booths 1210, 1212, 1214
April 30th - May 1st - Austin, Texas
YSI Instruments, YSI
Professional Plus, YSI ProODO, Optical DO
Meter, Ecosense, pH, YSI Pro20, ysi, pH
meters, multiparameter meters, EcoSense
DO200 ,EcoSense EC300, EcoSense ORP15,
ecosense ph100
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YSI Professional Series Professional Plus InstrumentOn Sale Now!Offering the ultimate in versatility, the YSI Pro Plus can accommodate any cable and corresponding probe combination. Choose from the following probes: dissolved oxygen (galvanic or polarographic probe), pH, ORP, ph/ORP combination, ammonium, chloride, and nitrate. Single probe and dual probe cables are available. All cables provide temperature measurements with no temperature probe needed. Cables offering conductivity measurement capability require no additional conductivity probe since the probe is built-in with the cable. The Professional Plus offers interval or single event logging and features a 2,000 data-set memory with additional GLP event logging. This instrument can even log data and then download it to a PC using Data Manager software (included). A graphic display provides detailed messages and instructions, and both the display and keypad are backlit. The rubber over-molded case features an IP-67 waterproof rating. Software, communication dock, and USB cable included. Complete Specifications. |
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YSI ProODO Handheld Optical Dissolved Oxygen MeterRugged and reliable, this meter uses an ODO (Optical Dissolved Oxygen) luminescent sensor that eliminates both the need for stirring and frequent membrane changes. Because the sensor has no flow dependence, it is ideal for deep water profiling where stirring is either difficult or undesirable. In addition, the lack of flow dependence reduces the possibility of operator error and ensures high quality data. The ProODO features a DO range of 0 to 500% and includes a barometer for continual compensation. The “smart” digital sensor technology stores calibration data within the sensor, allowing probes to be placed on any ProODO instrument without calibration. The meter’s advanced technology reduces the time and expense related to calibrating and maintaining sensors. Depending on usage, calibrations can be stable for up to one year, and there are no electrodes to clean or solutions to change. The meter stores 2,000 data sets (sensor data, date, time, site, and user-defined information), and managing the data is easy using the included Data Manager software. The ProODO features a backlit display and keypad and is housed in an impact-resistant, IP-67 waterproof case. Three-year warranty on the instrument and two-year warranty on the cable and probe from the manufacturer Complete Specifications. Complete Specifications. |
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YSI Professional Series Pro20 Dissolved Oxygen MeterCombine this single probe instrument with a cable and probe. All of the cables provide temperature measurements (with no temperature probe needed). A graphic display provides detailed messages and instructions. Both the display and keypad are backlit. The rubber over-molded case features an IP-67 waterproof rating. Complete Specifications. |
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YSI EcoSense pH10Designed specifically for spot sampling applications, the pH10 will fill the need for simple, one-handed operation instrumentation. Whether the need is a single sampling instrument for temperature and pH for wastewater, surface water, aquaculture, hydroponics, pools, or education the pH10 is perfect. The pH10 is designed for quick, accurate results in an economical platform. The ability to measure with a simple, compact instrument allows the pH10 to be used in multiple application strategies. With a one-year instrument warranty the pH10 is a logical choice for a low overall cost of ownership instrument. Complete Specifications. |
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YSI EcoSense ORP15Designed specifically for spot sampling ORP applications, the ORP15 will satisfy the requirement for a simple, one-handed operation instrument. The ORP15 provides the opportunity to perform a simple calibration in order to read relative mV values. The instrument also gives a direct read absolute mV value. The ORP15 has an electrode that is easily replaceable without the need for tools. The hold mode will display a stable reading until the button is pressed again to release it. In order to improve data management, the value can either be written down or simply recorded in the ORP15 memory feature! The instrument is capable of storing 50 sets (ORP, temperature, date, and time stamp). The YSI ORP15 is designed for quick, accurate results in an economical platform. The ability to measure ORP and temperature in a simple, compact waterproof instrument allows the ORP15 to be used in multiple application strategies. The ORP15 has a one-year instrument warranty and a six-month electrode warranty. Complete Specifications. |
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YSI EcoSense pH100Measure pH or mV and temperature simultaneously with the economical pH 100 Meter. The meter’s Autolock feature allows the unit to automatically sense the end point and “lock” the display to indicate the end point value of pH or mV measurements. In addition to easy one-handed operation, the meter also features electrode offset recognition, electrode slope recognition, display of electrode efficiency, and internal buffer recognition. Built for rugged use, the meter has a splash-proof, water resistant IP-65 housing and low battery indicator. Electrodes sold separately. One-year warranty on instrument. Six-month warranty on electrodes.Complete Specifications. |
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YSI EcoSense DO200Compact and affordable, the DO 200 provides quick, accurate dissolved oxygen and temperature measurements simultaneously. The screw-on cap membranes reduce stirring dependence, offer fast response times, and are easy to replace. The weighted probe assembly sinks quickly and is protected from impact. Dissolved oxygen measurements are displayed in either % oxygen saturation or ppm (mg/L). Other features include a watertight housing which meets IP-65 specifications, low battery indicator, push-button calibration, and compensation for temperature, pressure, and salinity for accurate measurements in varying conditions. Two cable lengths available. One-year warranty on instrument. One-year warranty on cable and electrode. Complete Specifications. |
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YSI EcoSense EC300This compact, handheld meter measures conductivity, specific conductance, salinity, and temperature. Features include a super-stable four-electrode conductivity cell, calibration back-up, convenient one-hand operation, a user-friendly interface, and a water resistant, splash resistant case (meets IP-65). Two cable lengths available. One-year warranty on instrument. Complete Specifications. |
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FarrWest Environmental Supply, a YSI DistributerAs a distributer of YSI products, FarrWest can provide you with any product in YSI's EcoSense, Pro Series, and standard lab and field lines of products. If you don't see the item you are looking for among our featured products, click the "Get a Quote" button below, and tell us what your are looking for. We will get back to you with a competitive price for your item. |
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