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I appreciate you wanting to have a meter, but I also think that in your type of scenario, you'll probably be much faster using the camera LCD. Typically, when using a flash meter, you are usually using the incident mode, meaning that you have to (or have someone) put the meter where the face is and pointed back at the camera, measuring the light hitting the dome, which should be the same as the light hitting your subject, then read the f/stop and set it on the camera. Even if you're fast with the meter, it's going to take you longer than chimping. I'm not saying don't do it, but just have realistic expectations.