650MDS Display

Manufacturer: YSI
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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.

Key Features

  • 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


  • Operating: -10 to 60° C for visible display
  • Storage: -20 to 70° C

Waterproof Rating

  • IP-67 for both the standard alkaline battery configuration and for the rechargeable battery pack option


  • MS-8
  • Meets IP-67 specification


  • Width: 4.7 in, 11.9 cm
  • Length: 9 in, 22.9 cm


  • 2.1 lbs, 0.91 kg (batteries installed)


  • VGA
  • LCD with 320 by 240 pixels with backlight


  • Standard: 4 alkaline C-cells with detachable battery cover
  • Optional: Ni metal hydride battery pack with attached battery cover and 110/220 volt charging system


  • 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


  • 4 LEDs illuminating LCD
  • User-selectable


  • 20 keys
    • Instrument on/off
    • Backlight on/off
    • Enter
    • Esc
    • 10 number/letter entry keys
    • 2 vertical arrow keys
    • 2 horizontal arrow keys
    • Period key
    • Minus key


  • CE, EU Battery compliance
  • FCC
  • IP-67
  • WEEE
  • C-Tick