Multi-probe, hand-held circuit tester

In a circuit testing device, the combination comprising:

• (a) a casing having opposite ends,
• (b) a single probe rigidly projecting from one end of the casing whereby the casing may be manipulated to forcibly insert the probe into an electrical power socket,
• (c) the casing carrying a first socket having a terminal and there being a second probe operative connected with the socket terminal,
• (d) circuitry in the casing including at least one Zener diode and at least one half wave rectifier interconnecting the single probe and said socket terminal,
• (e) a presence of voltage circuit in the casing and electrically connected with said single probe, said circuit including a presence-of-voltage indicator means and rectifier and amplifier means electrically connected between the single probe and the indicator means, the rectifier means including a rectifier bridge having two terminals connected acros the Zener diode,
• (f) there also being a voltage level indicating meter connected in series with said circuitry,
• (g) said casing also having front and rear faces and opposite sides, there being two recesses defined by the casing and adjacent said one end of the casing, said recesses opening at said one end and at said opposite sides respectively, said single probe carried by the casing to project from said one end of the casing at a location between said recesses,
• (h) said second probe connected via a wire with a jack received in the first socket and extending in one of the recesses, the first socket carried by the casing,
• (i) said meter being located between said recesses, and there being a second socket carried by the casing and a third probe that is connected via a wire with a jack received in the second socket and extending in the other of the recesses.