Abstract: A circuit board holder having adjustable compartments for different size circuit boards with the walls of the compartments having a set of openings therein for fastening dividers thereto, each of the dividers having adjustable slots therein for positioning and attaching the dividers to the compartment walls and a guide for holding a circuit board in a spaced upright position in the compartment and a member that supports at least a portion of the circuit board in the compartment to prevent the circuit boards from falling out of the circuit board holder. The circuit board holder can be either installed in a carrying case or stacked on a shelf.