The SEKONIC L-398 Studio Deluxe professional mechanical pointer light meter is a classic and essential tool for light control in studio and film photography. It features a purely mechanical structure that requires no batteries, relying on a cadmium sulfide sensor for metering. It has a rotating incident and diffuser white sphere on top and comes with high and low light zone metal shutters, adaptable to various lighting conditions. The dial integrates multiple scales for ASA/DIN ISO, shutter speed, aperture, EV exposure, and flash ratio, providing intuitive readings. A zeroing adjustment knob on the back ensures a sensitive and smooth pointer for precise control of film exposure.