R & R Technologies, Inc. announces its PS-1 portable bench top power supply with built-in rechargeable batteries that allows the testing of low-power circuits without cord or power-main limitations. This power supply can be used to set up long-term tests that are less susceptible to test-stopping power outages or glitches than corded power supplies. It can run for days on a full charge, facilitate field-testing and support true power-main-independent testing. It can be used with devices that run at 1.2 to 15 V in end-user applications, and its adjustable-voltage functionality allows the testing of devices at various stages in their lifecycles. The power supply includes a three-digit LED display, and it has an adjustable-current limit of 10 mA to 1,000 mA.