But they are instead cumbersome and outdated. Something as simple as completely dissolving salts in a medium, is in reality, a Science. Often this cannot be achieved with simple mechanical processes. The only choice that the user has with mechanical products, is to increase the stirring time or the temperature. With electronics, you can do more . . .
Electronic controls allow the stirrer to control the speed with greater accuracy.
By using electronic devices, the speed of the motor can be governed not to exceed a pre-set RPM, with or without a load. This also has the added advantage that the motor can be running at the maximum operating speed with a load, and if the load is suddenly removed, the circuitry will not allow the motor to increase in speed which would damage the unit. This cannot be done with a mechanical stirrer. To accomplish this, Hanna has incorporated motor drivers which reverse the direction at certain user-selected time intervals. Adjusting the stirring speed with a mechanical stirrer is inaccurate.