Northern Brewer - Maelstrom Stir Plate for Beer Yeast Propagation in Home Brewing Beer or Wine Making. The first industrial-grade programmable stir plate designed specifically for yeast starters Five distinct speeds, from 480-1440 RPM, to accommodate yeast starters up to 5 gallons Scheduling function for up to 48 hours Powerful magnets will never throw a stir bar. Includes 50mm Stir Bar. Large 8 W x 8  L stirring platform Five distinct speeds, from 480-1440 RPM, to accomodate yeast starters up to 5 gallons<br> Scheduling function for up to 48 hours<br> Seamless surface for easy cleaning &amp; maintenance<br> Powerful magnets will never throw a stir bar. Includes 50mm Stir Bar.<br> Translucent body lets you watch the magnets in rotation<br> Standard 12 V Power Aa<br> Large 8&#034; W x 8 &#034; L stirring platform