The T-10A is an illuminance meter that is used for taking lux measurements and evaluations; in other words, a lux meter. This lux meter is capable of calculating and displaying the average values of illumination on a LCD screen. Both, the T-10A and T-10MA, are able to provide illumination value comparisons that can be displayed as a percentage value or as a difference according to the user’s preference. Users can choose to manually enter target levels by using the keypad or via measurement. The T-10A can automatically calibrate after powering the device. The device can also measure intermittent and continuous light sources. Certain light sources may require adjustment; this device allows users to enter color correction factors for those adaptations.