The latency bro is used to measure the latency, response time, of games on CRT or LCD TVs. It was used to accurately measure the input lag and full latency of the Recalbox RGB JAMMA during its design phase, with a view to comparing results with competing solutions or original games. By demystifying the notion of input lag, often misunderstood and very rarely measured in retrogamer communities, it played a major role in the arcade community's "refusal to change" phase :P