The Newport 850G Long-Travel Actuator is able to provide up to 50mm of travel and replaces manual actuators such as the Newport SM-25 and SM-50 for applications where motor control is more desireable. For convenience, there is also a manual positioning knob. The 850G has a adjustable limit switch to prevent overtravel damage. Overall length of the body is 4.76 inches, so it is really not much longer than the manual actuators it would replace. These have a 262:1 ratio. This can be driven by many of Newport's controllers, such as the ESP7000, MM4006, ESP6000, ESP300, and ESP100.