NK-4200 Mini OTDR adopts 4 .3-inch capacitive touch screen . It integrates 12 functions , such as auto OTDR, expert OTDR , event map , OPM , RJ45 cable tracker , and computer level file management to meet various test requirements in different occasions . OTDR has a maximum dynamic range of 26dB , 8G memory , and can store more than 200 , 000 curves ; it is equipped with high-density polymer lithium battery , intelligent power saving management , measuring time of more than 8 hours , and supporting power supply and charging of the power bank.