Abstract: An automatic, portable solid state voltage regulator tester, specifically made for testing Ford and General Motors regulators. The face of the tester has contacts arranged for the manual application of either of the regulators and the regulator under test is held against these contacts with the thumb. A merit switch is pressed and if the meter rises to a marked area, pauses for a moment, and then drops to zero, the regulator is satisfactory. If the meter does not rise, or if it rises but does not drop back to zero, then the regulator is defective.