Waterproof, rugged and reliable, the YSI 550A is designed for the field with innovative field-replaceable DO electrodes, over 2,000 hours battery life, CE compliance, a 3-year warranty on the instrument, and a 1-year warranty on the replaceable electrodes. Measure temperature and dissolved oxygen simultaneously, and replace the DO electrode quickly and easily. Uses easy-to-install cap membranes. Range: 0-50 mg/L x 0.01, 0-200% Air Saturation.
