Electrical continuity and voltage testing device

Claim 1

In a circuit testing device, a. two probes one of which is sized for insertion into a single electrical socket receptacle to test for the presence of voltage, and both of which are applicable to spaced conductive elements to test for electrical continuity therebetween externally of said device, there being means connecting said probes in series for said continuity test, b. detection means operatively connected with said probes and including indicator means to indicate the presence or absence of voltage when said one probe is inserted into said socket single receptacle, and to indicate the presence or absence of electrical continuity when said two probes are applied to said spaced conductive elements, there being a casing carrying said detection means and sized to be hand carried, said one probe projecting relatively rigidly from said casing, c. said detection means including a gas discharge lamp and electrical resistance, both connected in series between said one probe and the casing, d. said indicator means including photocell means located to be illuminated by radiation from the lamp, amplififer means connected with the photocell means, and indicator structure connected with the amplifier means output.