The Talboys the Advanced 3750 reciprocating shaker are designed for a wide range of applications including cell cultures that require accurate and repeatable results. The microprocessor control provides consistent uniform shaking while safely ramping to the set speed. Operating Features: Accu-drive shaking system: the exclusive accu-drive shaking system delivers exceptional speed control, accuracy, and durability (Advanced 3500). The shaking system in both models continuously monitors shaking speed and maintains set-point,even under changing loads. Displayed speed is accurate to 1 percent of setting. Microprocessor control: The variable speed microprocessor control provides consistent uniform shaking action. Triple eccentric drive: Permanently lubricated ball bearings and maintenance free, brushless DC motor provide reliable service and continuous duty operation (3500 Orbital Shaker only). Single eccentric drive: Permanently lubricated ball bearings and maintenance free, brushless DC motor provide reliable service and continuous duty operation (3750 Orbital Shaker only). LED display: Touch pad controls with easy-to-read, independent LED displays for speed and time allow operator to view both settings at once. Provides repeatable and accurate results every time and is easily visible across lab benches. Timer will display elapsed time or when programmed to user defined limit,will shut off unit when time reaches zero. Display will show last used settings,even after power has been turned off. RS-232 interface: Provides two-way communication for data logging and unit control. Speed calibration mode: Allows user to automatically recalibrate speed display. Safety Features: Load sensor: A built-in load sensor detects unbalanced conditions and automatically reduces rpm to a safe speed to protect samples. Overload protection: Audible and visual signals will activate when system detects an obstruction or overload of the tray.