Adapter cap: Slide the end of a fiber into the adapter cap until the fiber stops. To install an optional adapter cap, unscrew the installed cap; then screw on the optional cap.
Illumination port: Insert the opposite end of the fiber into the port to light up the fiber core. Lighting the core can improve the visibility of certain flaws.
Eyepiece and light switch: Hold down the light switch while looking into the eyepiece.
Focusing dial: Turn the dial until the image is clear.
Battery hatch: Unscrew the hatch to access the batteries.(No Batteries Included)