Large range with high accuracy: Illuminance meter measures light intensity in a range of 0.1-400,000 lux (0.1-40,000 FC), quickly and accurately detecting both weak and strong light. Suitable for photography, plant growth, car headlights, set design, factories, offices, or homes Quick-response 270 rotatable detector: Readings taken in just 0.4 seconds, with a built-in calibration sensor measuring light levels at 3-4 readings per second. The 270 rotatable optical detector ensures precise light measurements from multiple angles Multifunctional measurement: Features include 2 units of switching (lux & FC), MAX/MIN mode, temperature display (C/F), backlight, low battery reminder, auto off, data hold, and data storage (33 sets) functions, facilitating convenient light measurements Wide applications: Measure a variety of visible light sources in homes, schools, offices, workshops, stages, farms, and factories. Detect uneven illumination from car headlights or LED bulbs to ensure consistent brightness Product contents: Includes 1 HoldPeak digital light meter with sensor cover, 1 carrying case, 3 AAA batteries, 1 screwdriver, and 1 user manual. Note: This is not a professional photography light meter; calculate shutter speed and aperture after obtaining basic lux readings