the test the microphone 111 may be used to capture and record local sounds such as the voices of the test subject and or test administrator the hand actuated momentary contact single or dual control switch 113 is used to signal the response to a visual challenge test detailed below the hand actuated momentary contact single or dual control switch 113 may either be a separate unit wired to the handheld device or connected through a usb or other peripheral connection a wireless connection or a built into the handheld device the power source 102 may be embodied as one or more disposable batteries or optionally the combination of a rechargeable battery and a transformer or solar cells for receiving power in some embodiments the wireless transmitter 112 communicates with a cellular network wi fi internet connection or a bluetooth connection the peripheral device ports 106 may be any combination of mini micro and or full sized usb port or other type of peripheral device connection upon activation the device is controlled by way of program instructions in the form of a smart phone and tablet application the program instructions enable a test administrator to collect identification and biometric data and determine quantitatively a test subject 39 s reaction and response time and precision reflexes to a visual stimulus and display the information as actual time in seconds and milliseconds adjusted time taking into account a specified time penalty for incorrect responses and an equivalent bac value turning now to fig2 which illustrates a perspective view of preferred embodiment of a handheld computing testing.