How to FIND an exterior house Leak?

had a Sunroom Addition and since, we have had a leak. Obvious assumption is it is where the Roof of the sunroom meets the house. I can hear the leak, as water droplets are hitting the top of the fireplace inset. I've walked the roofline to look to see any obvious spots where the flashing might be the issue. ** I did find a corner brick to a far end window that is cracked and looks like rain water could seep in there. (Will silicone caulk that when it dries up outside. --- BUT is there a means a moisture meter or something could pinpoint where the water is coming in from?
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