Measure the brightness of any light source with luminosity unit conversion to enable accurate exposure assessment and easy comparison across sources. Data retention stores the maximum and minimum readings, allowing you to monitor exposure changes over time; a low power indicator alerts you when the battery needs attention. Automatic or manual shutdown options help conserve power and fit your workflow. Temperature measurement function provides ambient temperature data alongside light measurements for more complete environmental monitoring. Compact design and reliable performance make the device suitable for on site use in professional settings. Practical use scenarios: Photography and videography: quickly assess key light brightness, convert units for exposure planning, and rely on the auto shutoff to save battery during long shoots. Horticulture and indoor growing: monitor light intensity to meet plant requirements, use max/min readings to track daily variation, and cross reference with temperature data for growing conditions. Work environments and labs: verify workstation lighting levels and ambient temperature, keeping a record through data retention while managing power with automatic or manual shutdown. Key attributes at a glance: function includes light measurement with unit conversion and temperature sensing; data retention for max and min readings; power management with low power indicator and shutdown options; designed for practical, real world use with clear, reliable measurements.