Prof. William Nelson, inventor of the EPFX-serial / EPFX-usb, has created a new device named EPFX-usb (EPFX-usb means to know). EPFX-usb is the next step in bio-energetic assesment technology.

Discover things you don't know about the EPFX-usb, from an interview with Prof. Nelson

Learn about the EPFX-usb's impressive array of new features.

Find out how to purchase or upgrade the new EPFX-usb device.

Answers to common questions can be found at EPFX-usb FAQ

New features offered by the EPFX-usb device:

• built-in processor chip
• faster information exchange rate
• additional patient biofeedback interaction
• more...