Looking for a rugged, field-worthy instrument for measuring dissolved oxygen? The new YSI 550A DO features a waterproof IP-67, impact-resistant case and innovative field-replaceable DO electrode modules. Measure dissolved oxygen and temperature simultaneously using YSI's proven polarographic technology for oxygen and YSI Temperature Precision ^TM thermistors, the worldwide standard for accuracy.
 

Waterproof! Meets IP-67 specifications Field-replaceable DO electrode modules Screw-on cap membranes Over 2000 hours battery life Calibrate in either mg/L or % saturation User-selectable temperature units (°C or °F) 12, 25, 50, and 100-foot cable lengths Expanded DO and salinity ranges for a wider application range

Three-year warranty on the instrument and one-year on the DO module and cable!
 

Measurements are fast and easy with one-hand operation, an easy-to-use backlit display, automatic push-button calibration, and a weighted, quick-sinking probe. The YSI 550A DO has a built-in calibration chamber, low-battery indicator, direct salinity, and altitude compensation. The instrument provides simultaneous readings of oxygen and temperature. Dissolved oxygen readings are automatically compensated for temperature.

PART #	DESCRIPTION	PRICE
550A-12	YSI 550-A 12' cable	$755.00
550A-25	YSI 550-A 25' cable	$795.00
559	DO Module	$151.50
5908	Membrane Kit	$45.00

• Call Toll Free 800-850-7274 to order today!

Medium:	Fresh, sea or polluted water
Dissolved Oxygen Sensor:	Steady-State Polarographic
Dissolved Oxygen Probe:	Field-replaceable module
Accuracy:	0-20 mg/L; +0.3 mg/L or +2% of reading, whichever is greater
	20-50 mg/L; +6% of reading
	0-200 %; +2% air saturation or +2% of reading, whichever is greater
	200-500%; +6% of reading
Range:	0-50 mg/L
	0-500 % air saturation
	-5°to +45° C temperature
Resolution:	0.01mg/L or 0.1 mg/L, user selectable
	0.1% air saturation or 1%, user selectable
	0.1°C temperature
Temperature Units:	Celsius or Fahrenheit, user selectable
Temperature Specifications:	Accuracy: +0.3°C
	Range:-5°to +45° C
	Resolution: 0.1°C
Altitude Compensation:	Yes
Salinity Compensation:	Automatic (0-70 ppt)
Temperature Compensation:	Automatic
Power:	4 alkaline C-cells
Size:	4.7 in. width; 9 in. length (11.9 cm x 22.9 cm)
Weight with Batteries:	2 lb. (0.91 kg)
Battery life:	Over 2000 hours at 25°C
Cables:	12, 25, 50, or 100-foot lengths
Other Features:	Waterproof to IP-67
	High impact resistance
	Push-button calibration
	Built-in calibration chamber
	Large, backlit display
	Low battery indicator on display
	CE compliance
Warranty:	3-year for the instrument
	1-year for the DO module