... didoe ,Features 1,Light -measuring levers ranging from 0.01 lux to 20.000 lux ,repeatedly2,High Accuracy and rapid response.3,Data-Hold ... ,and the indicating sign of "Lux ",Data-Hold "H",Range "20.000","*10"(reading by ten ),Low Battery "BT",etc 2.Range ... indicator :It indicates 20 lux ,200 lux ,2000 lux and 20,000 lux ranges ,respectively .3 ...