Magnetic stirrers are designed for general-purpose laboratory use in routine mixing applications. Many variations are available, with features such as slow speeds for encouraging cell culture growth or large capacities for high-volume applications. Powerful motors and magnets offer exceptional magnetic force, and in many models microprocessors control speed precisely through the entire range. Magnetic stirrers can be small and compact or low-profile but with large top plate surfaces depending on specific function, but all are rugged and robust for long-term use.