The Ideal 61 686 digital light meter measures all visible light sources including LED lighting. The meter measures in four ranges up to 20,000 FC or 200,000 Lux and has a basic accuracy of +/ 3%. This model features a max reading mode, data hold mode and has auto zero adjustment, low battery indication and an auto power off function. Ideal Industries was started in 1916 by J. Walter Becker. His belief that every product should be worth more than the price paid for it has been the core IDEAL business principle for over 90 years. Today, the many loyal distributors and customers that make IDEAL successful are a testament to Becker s original philosophy.