 where we actually make a display and the eye, if you're not looking at it on a lab scope and then looking back at a pre-recorded function of it, your eye won't see the change, but the scope will. The scope is faster than the eye if you're using a good one. And the same can be said about your voltmeter. So it's just really super important, the equipment you're using. For the record, I'm not a fan of phone apps as far as for scan tools because you're limited by the CPU processor speed of the phone itself.