Testo 540: Top-notch Specifications, Comprehensive Comparisons, And Trusted Buying Sources
Testo 540 Information the information about the Testo 540 light meter: Introduction The Testo 540 is a compact, easy-to-use light meter that is ideal for measuring lighting conditions in the workplace, shops, and offices. The light sensor is modeled on the spectral sensitivity of the human eye, and is therefore ideal for measuring the quality of light for human comfort and performance.