YSI Meters 

Model 550A

Faster Response Times!

• The YSI 550A DO features a waterproof, impact resistant case and innovative field replaceable DO electrode modules

• Measures dissolved oxygen and temperature simultaneously using YSI’s proven polarographic technology for oxygen and YSI PrecisionTM thermistors, the worldwide standard for accuracy

• Has a built-in calibration chamber, direct salinity and altitude compensation

• This instrument provides simultaneous readings of oxygen and temperature. Dissolved oxygen readings are automatically compensated for temperature

• Waterproof and easy-to-use back lit display

• Field replaceable DO electrode modules

• Over 2000 hours battery life

• Calibrated in either mg/L or % saturation with automatic push button calibration

• °C or °F temperature display

• Three year warranty on the instrument, one year warranty on DO module 

Model 55

• Displays dissolved oxygen in mg./L or % oxygen and temperature simultaneously

• Large, back-lit display is easy to read in any lighting condition

• Waterproof and it floats (just in case!)

• Built-in altitude and salinity compensation

• Fast sinking probe is made from stainless steel

• Operates over 300 hours on six AA batteries (included)

• Super easy push button calibration 

Economy Oxygen Meter

The YSI DO200 is designed for quick, accurate oxygen and temperature readings!

• Watertight housing

• Automatic temperature compensation

• Manual salinity compensation

• Low battery indicator

• Screw on cap membranes with low stirring, fast response probe

• Available with a 12' (4 meter) or 30' cable (10 meter) - order separately 

550A Meter with 12' Cable $889.99	550A Meter with 25' Cable $921.19	550A Meter with 50' Cable $973.19	550A Meter with 100' Cable $1,035.69
550A Replacement Probe $197.39	Model 55 Meter with 12' Cable, Probe $780.69	Model 55 Meter with 25' Cable, Probe $822.29	Model 55 Meter with 50' Cable, Probe $910.79
Model DO200 Oxy/Temp Meter w/o Cable or Probe $270.19	Model DO200 Oxygen / Temperature Probe w/12' Cable $270.19	Model DO200 Oxygen / Temperature Probe w/30' Cable $300.79

Ayers Family Koi Farm

Route 1 Box 345

Webbers Falls, Oklahoma 74470

Phone: 1-888-746-7375

E-mail: mark@ayerskoi.com