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Data Display and Logging System


Log real-time data, calibrate YSI 6-Series sondes, set-up sondes for deployment, and upload water quality data to a PC with the feature-packed YSI 650MDS (Multiparameter Display System). Designed for reliable field use, this display and data logger features a waterproof IP-67, impact-resistant case.

YSI 650MDS Display and Logging System
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YSI has Authorized Distributors all over the globe. View a map and find your closest contact for YSI 650MDS products and accessories.

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Have a question about your YSI 650MDS ? Check out the support page with resources compiled just for you.

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Want to return a product for service? Here you'll find authorized service centers and instructions on how to send in your YSI 650MDS .

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Battery Life
With the standard alkaline battery configuration of 4 C-cells, the YSI 650 will power itself and a YSI 6600 sonde continuously for approximately 30 hours. Or, choose the rechargeable 120 v battery pack (YSI Part # 6113) option with quick-charge feature.

Optional Barometer
Temperature-compensated barometer readings are displayed and can be used in dissolved oxygen calibration. Measurements can be logged to memory for tracking changes in barometric pressure.

Optional GPS Interface
Designed to NMEA protocol, the YSI 650MDS will display and log real-time GPS readings with a user-supplied GPS interfaced with YSI 6-series sondes.

Memory Options
Standard memory will allow for approximately 150 data sets. Exact logging capacity is dependent on the number of active parameters in the 6-series sonde. Optional high memory (1.5 mB) would make it possible to easily upload the data from 7 sondes, each of which have data files of approximately 75 days at a 15-minute sampling interval.


  • Compatible with EcoWatch® for Windows® data analysis software
  • User-upgradable software from YSI’s website
  • Menu-driven, easy-to-use interface
  • Multiple language capabilities
  • Graphing feature
  • Three-year warranty

Related Products

YSI water quality sondes - legacy

Legacy Sondes
YSI 6820 V2 showing sensors, starting clockwise from top: ROX Optical Dissolved Oxygen, Turbidity, pH, ISE, and temperature/condutivity.

6820 V2
YSI 600XLM V2 shown without probe guard.

600XL V2 and 600XLM V2
The YSI 6600EDS showing Turbidity (center) with attached wiper brush, Clockwise from top: Chlorophyll, pH/ORP, Temperature/Conductivity, and Rapid Pulse Dissolved Oxygen Sensors.



YSI 600XL with 650 MDS Handheld display and Flow Cell.

600XL and 600XLM
YSI 600QS 'Quick Sample'

YSI 600R shown with probe guard attached.

YSI 600LS 'Level Sonde' shown with probe guard attached.



YSI 6500 Process Monitor

6500 Process Monitor
YSI 6-Series Anti-fouling Sensors and Wipers

6-Series Anti-Fouling Kits





YSI650MDS Display & Datalogger Specifications

Temperature Operating
-10 to +60°C for visible display
-20 to +70°C
Waterproof Rating IP-67 for both the standard alkaline battery configuration and for the rechargeable battery pack option
Connector MS-8; meets IP-67 specification
Dimensions Width
4.7 in, 11.9 cm
9 in, 22.9 cm
2.1 lbs, 0.91 kg (batteries installed)
Display VGA; LCD with 320 by 240 pixels with backlight
Power Standard

4 alkaline C-cells with detachable battery cover
Ni metal hydride battery pack with attached battery cover and 110/220 volt charging system
Communications RS-232 to all sondes, for data transfer to PC, and for software updates
Optional GPS NMEA 0183; requires user-supplied GPS and YSI 6115 Y-cable
Backlight 4 LEDs illuminating LCD; user-selectable
Keypad 20 keys, including instrument on/off, backlight on/off, enter, esc, 10 number/letter entry keys, 2 vertical arrow keys, 2 horizontal arrow keys, period key, and minus key


3 years


CE, EU Battery compliance, FCC, IP-67, WEEE, and C-Tick
Assembled in the USA


Ordering Information

Item # Description
650-01 Instrument, standard memory
650-02 Instrument, high memory
650-03 Instrument, standard memory, barometer
650-04 Instrument, high memory, barometer
6113 Rechargeable battery pack kit with 110 volt charger and adapter cable
616 Charger, cigarette lighter
4654 Tripod
614 Ultra clamp, C-clamp mount
5081 Carrying case, hard-sided
5085 Hands-free harness
5065 Form-fitted carrying case
6115 Y-cable for interface with user-supplied GPS system

YSI Belt Clip for All Pro Series Meters

3069 Belt Clip

Easily attach any Pro Series, 556, or 650 instrument to your belt or other convenient location with this simple clip.

YSI Tripod Connects to the Back of the Instrument

4654 Tripod

This small 4654 tripod supports the instrument at a convenient viewing angle.

YSI 6-series field cable

6-Series Field Cables

Rugged cables designed for field use with 6-series sondes.

Field cable to RS-232 adapter.

6095B Adapter Cable

YSI 6-series field cable to RS-232 adapter.

6113 Charger Kit

6113 Rechargeable Battery Pack Kit for 650MDS

Rechargeable battery kit for 650MDS.

GPS Y-cable for 650MDS

6115 GPS Y-Cable

GPS Y-cable for 650MDS.

YSI Ultra Clamp Connects to the Back of the Instrument

614 Ultra Clamp

This small clamp supports the instrument at a convenient viewing angle. Ideal for attaching the instrument to the gunwale of a boat, table, or and surface with an edge to clamp to.

6-series hard case.

6930 Rugged Carrying Case

A hard-sided carrying case ideal for all 6-Series sondes and systems.





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