Check the listing for details. Vivitar EFM-2 Electronic Flash Meter 2. Condition: Used. Listed at 29.99 USD. It turns on but I am unsure how to tested properly. So it's not tested at 100% This electronic flash meter is designed to measure the flash output of your camera. With a brand name of Vivitar, this flash meter is compatible with a variety of cameras and can fit easily onto them. The model number for this flash meter is Vivitar EFM-2, and it is perfect for measuring flash in any lighting condition. The measuring mode of this flash meter is flash, making it the ideal tool for photographers looking to measure the flash output of their camera. It belongs to the categories of Cameras & Photo and Lighting & Studio, specifically to Light Meters. The flash meter is great for anyone looking to improve their photography skills, and it is an essential tool for all professional photographers.