Sekonic L-308S-U Flashmate Light Meter (401-307) Pocket-sized Digital Meter for Incident and Reflected Flash and Ambient Light Readings. Smallest digital flash-meter for reflective and incident light readings in ambient or electronic flash lighting conditions. Exposures accurate down to a tenth-of-a-stop for both ambient and electronic flash light readings in full-stop mode. Meter can also display shutter-speeds and apertures in half or third-stop increments to mirror the exposure settings on your camera. At ISO 100, the ambient EV range is 0 to 19.9, flash f/stops range from f/1.4 to f/90.9 with a shutter-speed span of 60-seconds to 1/8000th-of-a-second (1 sec to 1/500th for flash). Pocket-sized, and easy to stow away. The L-308S measures 2.5"W x 4.3"H x 0.9"D (63mmW x 110mmH x 22mmD), and weighs in at 3.4 ounces (95g). 1-Year Warranty, extendable at no charge to 3 years total (USA only) after registration, backed by our outstanding customer support team.