650 MDS Multi-Parameter Display System

6-Series Legacy Sondes

View YSI 6-Series water quality sondes being used in a variety of water environments for long-term underwater monitoring and spot sampling.

PriceRequest Pricing



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.

  • Overview

    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

  • Specifications
    Certifications FCC, WEEE, IP-67, CE, and C-Tick. Assembled in the USA., EU Battery compliance
    Connectivity / Communications RS-232 to all sondes for data transfer to PC & software updates
    Connector meets IP-67 specification, MS-8
    Desktop Software Compatible Eco-Watch
    Equipment used with Any 6-Series Sonde
    GPS NMEA 0183, requires user-supplied GPS and YSI 6115 Y-cable
    Graphic Display LCD with 320 x 240 pixels with backlight
    Keypad esc, 2 horizontal arrow keys, backlight on/off, 20 keys, period key, 2 vertical arrow keys, 10 number/letter entry keys, and minus key, enter, including instrument on/off
    Logging Capabilities Yes
    Memory 10KB for 150 data sets
    Multiparameter Yes
    Operating Temperature -10 to +60 C
    Power 4 C-size alkaline batteries or Ni metal hydride battery pack
    Sampling Yes
    Storage Temperature -20 to +70 C
    Warranty 3 years
    Waterproof IP-67
    650 MDS Display & Datalogger Specifications  
    Temperature - Operating -10 to +60°C for visible display
    Temperature - Storage -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
    Width 4.7 in, 11.9 cm
    Length 9 in, 22.9 cm
    Weight 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
    Power - Optional 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
    Warranty 3 years
    Certifications CE, EU Battery compliance, FCC, IP-67, WEEE, and C-Tick; Assembled in the USA

    Specifications indicate typical performance and are subject to change.

You may also need

Carrying Case, Large Hard-sided

Carrying Case, Large Hard-sided


ProDSS Multiparameter Water Quality Meter

Digital Sampling System multiparameter​ handheld provides extreme flexibility. Meter Only.

Request Pricing

Professional Plus (Pro Plus) Multiparameter Instrument

Multiparameter Instrument for DO, Conductivity, Salinity, pH, ORP, Ammonium, Nitrate, Chloride, Temperature and more. Meter Only.