The importer 400x manual fiber interface test meter is low cost,high quality which loads LED light for the testing light supply.The light shine to the special mirror,when you want to put the thing being tested on the adapter,it will form clear image.It is suitable for the outdoor fiber outdoor fiber interface connecting test and the lab fiber connector reparation.This products offer the fiber interface testing adapter fitting for the ST,SC,FC fiber connector test,using 3pcs AAAbattery can last 500 hours,mean while it can change into LC,MTRJ,MU interface testing adapter.