Abstract: A miniature vacuum-actuated test fixture for testing individual components or localized areas of circuit boards includes a probe module having an array of probes carried by a piston, and a separable registration module which may be visually aligned over a component or circuitry and attached before the probes are ever in contact with the circuit board. Once the registration module is attached to the circuit board, the registration module is joined with the probe module, and the probe module is evacuated, drawing the piston upward, carrying the probes into contact with the component or circuitry.