This Wort Whipper Ultra - Compact Magnetic Stir Plate is perfect for homebrewers and small - scale commercial brewers. Use it when you're making yeast starters to ensure better yeast health. It can be used with Erlenmeyer flasks up to 5000mL in size, and you can adjust the stir bar speed according to your needs. It's a compact and handy tool that simplifies the yeast starter process.