Lightly used flash meter with box and manual. (no case.) This kind of meter can measure ambient light in a way that the meter in your camera can't.
from AI: The Polaris SPD100 is a compact, handheld ambient and flash light meter designed for photographers needing accurate light measurements for both flash and ambient lighting conditions at an affordable price point.
Key Features
Ambient and Flash Metering: It can measure both ambient light and flash exposure, making it versatile for different photography setups