Tofra Inc. has introduced a focus drive with an integrated controller for optical microscopes. It provides computer-controlled movement of fine focus and retains manual movement of coarse focus. Mounting adapters are available for all major microscope brands. The focus drive operates in the entire vertical range of the microscope with up to 1-nm resolution. It connects directly to the computer serial port (or to the USB port via a USB-to-serial converter) with a custom cable and can be used with desktop or laptop computers. It can be daisy-chained with stage and filter wheels to create an automated microscope system. The cables carry only DC and communications signals, minimizing electro-magnetic interference.

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