The new YSI 550A dissolved oxygen meter
features a waterproof, impact-resistant case
and innovative field-replaceable DO electrode
modules. Measure dissolved oxygen and
temperature simultaneously using YSI's proven
polargraphic technology for oxygen and YSI
Precision thermistors, the world wide standard
for accuracy.

		Waterproof! Meets IP67 specifications
		Screw-on cap mambranes
		New PE membranes reduce stirring dependence
		Over 2000 hours battery life
		Calibrate in either mg/L or % saturation
		3.5 and 7.5m cable lengths
		Three-year warranty on the instrument and one-year on the DO module