Patent ID: 7200509

Claim:
A circuit tester for testing for reliably and repeatedly testing circuit boards in a plurality of different circuit conditions comprising: a first circuit board mounting plate; a probe plate aligned with said board mounting plate having a first set of probes of predetermined length and a second set of shorter probes; an actuator for moving said first plate and said probe plate toward and away from each other along a single axis from a first position wherein none of said probes contact said the circuit board on said mounting plate, to a second position wherein said first probes contact said circuit board and to a third position wherein said first and second probes contact said circuit board so that said circuit board may be tested under different conditions depending upon the probes in contact therewith; wherein said mounting plate and said probe plate include a plurality of apertures and are co-axially aligned and wherein a plurality of guide pins passes through said apertures to maintain said plates in substantially exact alignment regardless of their position relative to each other; and wherein said probe plate has upper and lower surfaces, said upper surface adjacent said circuit board, said upper surface having a first layer of first color, and a second layer bonded to and overcoating said first layer of a second color distinct from said first color and wherein a selected portion of said surface adjacent at least one of the apertures exposes said first color surrounded at least in part by said second color.