TR-TC200S-H series of laboratory mixer adopts structure compact series excitation type micro motor drive, suitable for Laboratory of low to medium, high viscosity liquid mixing. The machine consists of a drive motor, speed controller and increase moment mechanism etc. composition. Mixing console using quality engineering plastic and die cast aluminum alloy body, stable operating state; output end of the application of variable reinforcement mechanism, output torque multiplied; stirring speed is controlled by the microprocessor, can timely and effective compensation due to changes in load and power supply voltage fluctuation caused by the speed change, constant speed and reliable; built-in soft start moving, automatic overload protection, security experiment with full load for long time continuous operation Security; stirring speed stepless adjustment to meet the stirring speed as amended from time to time. Digital display speed directly, to provide convenience for the experimental data acquisition; operation timing control function to ensure experimental time of effective control.