The T-10MA illuminance meter is a Lux meter used wherever the lux measurement, or illumination strength of light striking a certain location, is needed for evaluation. The lux meter also has the ability to calculate the average values and illumination and display them on the LCD screen. These lux meters enable the comparison of illuminance values that can be displayed as a difference or percentage value. Target levels can be entered into the lux meter by measurement or manually using the keypad. The T-10A has the ability to automatically calibrate after switching on the device, measure continuous and intermittent light sources, and users can enter color correction factors for adaptation to certain light sources. This lux meter features a very large measurement range of 0.01 to 299,900 lx and automatic range switching. The T-10A also measures PWM (Pulse Width Modulation) controlled light sources. The receptor head is removable to accommodate various types of measurements. Plus, users have the ability to connect multiple – up to 30 – receptor heads so measurements can be taken at several points simultaneously without moving the lux meter. This feature is especially convenient for large movie screens requiring the measurement of various areas simultaneously. A miniature receptor model is also available for easily measuring illuminance in narrow spaces. The interface with computer also changed from RS-232C to USB.