The YSI 5905 provides vigorous stirring for accurate measurement and faster response time. Designed for easy maintenance, the stirrer pulls out for quick replacement of the easy-to-install cap membranes. Compatible with 300 mL BOD bottles, the YSI 5905 comes with a flexible power cord and a one-year warranty. Usable with all YSI oxygen meters except the YSI 55, 85, and 95.