1.Switch illumination unit and(Lux/Fc)temperature unit(/). 2.Two recording modes: automatic storage of illumination data (up to 2000 groups) and manual storage (up to 60 groups). 3.Automatic range and quick response, measuremwent in environment with insufficient light. 4.Screen backlight for darkroom operation. 5.Auto-off after no operation for a long time (the default span is 10 mins and can be reset).