Purpose: Introduction of the LEGO Mindstorms EV3 as a low cost research tool for various studies and to show how study tools could be built using the LEGO with ease. Methods: To show what the LEGO Mindstorms EV3 could do for studies, programming method was described and some example devices used previous papers were reconstructed; EX1 - Selection of left right device for Stoet(2010), EX2 - Time expectation device for Kim and Ryu(2015), and EX3 - Four digits random number generator for Huh and Lee(2015). Time delay of each example device was tested to evaluate effectiveness of the LEGO Mindstorms EV3 as research device. Results: Combination of single execution structure and button switch on the EV3 brick showed 1 ms error of time measurement, and combination of single execution structure and touch sensor showed 10 ms error of time measurement. 1 ms error of time measurement is same accuracy achieved by Windows based computer system.