Up to 200000 lux test range for easy testing of all natural and artificial light sources. Lux meter includes a builtin temperature sensor to accurately measure the current environment temperature in real time. Onekey conversion between LUX and FC; LUX is the luminous flux per square meter, FC is the luminous flux per square foot. 9V largecapacity battery for convenient operation and reliable power. Benefits and usage Provides clear, precise measurements of lighting levels to help you set up and verify appropriate illumination for various tasks. Realtime temperature data adds context to light readings, supporting more informed decisions in environments where temperature affects lighting performance or comfort. Quick unit switching between LUX and FC simplifies crossscale comparisons, accommodating different measurement standards. Longlasting power with a 9V battery reduces the need for frequent replacements, supporting continuous use in field or studio settings. Use scenarios Photography and videography: assess scene brightness in studios or on location to ensure proper exposure and lighting balance. Horticulture and greenhouse management: monitor lux levels to verify adequate light for plant growth and health. Building design and interior planning: compare natural versus artificial lighting across spaces to optimize lighting layouts and energy efficiency.