The Sekonic Litemaster PRO, L-478D is a light meter designed for photographers and cinematographers. It measures ambient and flash light, providing accurate exposure readings for proper lighting control. Some of its key features include:

1. Touchscreen Interface: The L-478D features a large, easy-to-use touchscreen interface for intuitive operation and quick adjustments.

2. Incident and Reflected Light Measurement: It can measure both incident light (light falling on the subject) and reflected light (light bouncing off the subject), allowing for precise exposure control.

3. Wireless Flash Power Control: With the optional Sekonic RT-32CTL module, the L-478D can wirelessly control the power output of compatible flash units, making it convenient for studio or on-location lighting setups.

4. Cine/HD Cine Modes: The meter offers dedicated modes for cinematographers, allowing them to measure and adjust exposure settings specifically for video and film production.

5. Customizable Exposure Profiles: Users can create and save up to 10 different exposure profiles, making it easy to switch between different shooting scenarios or lighting setups.

6. Illuminance Measurement: The L-478D can also measure illuminance in lux or foot-candles, providing information about the overall brightness of a scene.

Overall, the Sekonic Litemaster PRO, L-478D is a versatile and advanced light meter that helps photographers and cinematographers achieve accurate and consistent lighting in their work.