Thermo Scientific™ Stir Trac™ stir control provides improved slow-speed stirring, consistent speed, and strong magnetic coupling — reducing the risk of stir bar decoupling * Microprocessor control ensures accurate and stable setpoints for stirring speed * Stir Trac braking feature brings stir bar to an immediate stop for quick flask removal * Single control knob controls speed; lock feature prevents accidental changes * Digital rpm display * Clean easily and resist alkalis and acids * Seamless, reflective white ceramic surface aids sample visibility * Stirring adjustable in units of 1rpm * RS-232 port outputs time count, stir speed (set point) directly to your PC 

Safety Features * Rugged low-profile cast-aluminum body provides stability and durability * Unit design protects internal components from accidental spills * Walk-away timer shuts off stirring after 1, 2, 4, 8, or 12 hr.