Pocket-Sized Lux Meter Testo 540

The Testo 540 Pocket-Sized Lux Meter is a compact and efficient instrument designed for spot checks of lighting conditions in workplaces, offices, and shops. The light sensor is optimized to match the spectral sensitivity of the human eye, ensuring accurate measurements of both natural and artificial light sources. The device has a measuring range of 0 to 99,999 Lux (or 0 to 9,300 ftc) with an accuracy of ±3 Lux or ±3% compared to a reference instrument at 90° light irradiation. It features a resolution of 1 Lux for measurements up to 19,999 Lux and 10 Lux for the remaining range. The testo 540 operates with a fast measuring rate of 0.5 seconds, providing instant results.

Its ergonomic design includes a large, easy-to-read display, a hold function to freeze readings, and a min/max function for quick reference to the highest and lowest values recorded. A protective cap ensures safe storage when not in use. The device weighs only 95 g (including batteries and protective cap) and measures 133 x 46 x 25 mm, making it highly portable. It operates within an ambient temperature range of 0°C to +50°C and has an IP40 protection rating. Powered by two AAA batteries, it offers an extended battery life of up to 200 hours under standard conditions. The testo 540 is an excellent choice for professionals needing a reliable and precise tool for light measurement.