I've found that the combination of using my eyes to see the signal and then using my brain to analyze it correctly is really a great way to interpret the signals.
With one of these dedicated trading analyzer devices. but they cost millions and only a few firms can afford then ie GS.
First, make sure colorful green and red bars appear on your chart as price goes up and down. If a price bar is green, buy; if a price bar is red, sell. (I would like to personally thank TheAngryHermit for this valuable insight.)