The simplest FiberTrode available is called the LambdaTrode. Basically, it is a Lambda fiber with one microelectrode placed very close (50µm) to the optically active taper.
The LambdaTrode is less invasive than the classical optrode (i.e. an optical fiber and a wire microelectrode glued together), and offers the unique light delivery/collection capabilities of Lambda fibers.
LambdaTrodes are provided in a standard package for acute experiments. LambdaTrode configuration is defined by the Fiber Specs (numerical aperture/core size and taper active length), Shank Length and connector type.