A wireless receptacle tester system that includes an electrical tester with protruding terminal blades from a rigid housing. The tester includes an isolation circuit connected to an ACV/DCV converter and an Analog/Digital Converter. When a voltage is detected by, the tester, the voltage is automatically measured by the Analog/Digital Converter. Connected to the ACV/DCV converter is a DC Volt Regulator that regulates the 5 DC volts needed for the Analog/Digital converter, a microprocessor and a first Bluetooth module. The system also includes a Smartphone with a display and a second Bluetooth transceiver configured to pair with the first Bluetooth module. Loaded into the working memory of the Smartphone is a voltage display application. When the Smartphone is operated in the vicinity of the tester and the voltage display application is activated, voltage information is automatically transmitted from the tester to the second Bluetooth transceiver and displayed on the display.