1. An illuminometer (or meter) is a special instrument for measuring illuminance. 2. Photosensitive probe cover: It can prevent the probe from being damaged and has a good protection effect. 3. Personalized flip battery slot: battery powered (not included); the instrument has an automatic shutdown function, long-term use, energy saving and environmental protection. 4. Backlight display: LED backlit large screen, accurate and convenient reading. 5. Soft keys: rubber material, comfortable feel, easy to use for a long time.