Digital Response Time Apparatus is designed to measure the time interval after which the subject responds as any of the two visual red or green and two aural different tones stimuli is presented. The Apparatus is featured with sloping operating panels with a removable screen or partition between operator and subject with Electronics timer of 0.01 second resolution. The Digital Response Time Apparatus is offered in a compact design and is equipped with power on-off switch and indicators. Digital Response Time Apparatus is housed in an elegant rust proof cabinet.