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A camera is cheaper and a camera can measure speed as well as slowdowns and stoppages that a tube simply can't do. A tube was the old way but if you're going to
by blackflame7000 8y ago
A camera is cheaper and a camera can measure speed as well as slowdowns and stoppages that a tube simply can't do. A tube was the old way but if you're going to make a new device a camera makes more sense.