With the Testo 540 lux meter for artificial and natural light, you can quickly assess the lighting situation at workplaces in just seconds. The Testo 540 is an entry-level model specifically designed for fast spot measurements in workplaces, offices, and retail stores. The sensor is modeled after the spectral sensitivity of the human eye, making it ideal for evaluating illuminance. The measurement values are easily readable on the illuminated display, and with the push of a button, you can view the minimum and maximum values. The hold function allows for comfortable reading of the measurement values. This handy and very easy-to-use lux meter can be safely stored until the next measurement with the included protective cap.