1 Convenient connection. It can be detected by simply downloading APP bluetooth connection by mobile phone, and real-time detection of charging status, voltage, current, capacity and other indicators of USB power supply 2Resistance detection.voltage difference method is used to measure the resistance value of the data cable. By detecting the voltage size of different data cables, the advantages and disadvantages of the data cables can be judged (special load is needed fo 3 Quick identification, able to identify patterns QC2.0 and QC3.0 4High definition display screen is adopted to detect the voltage, current, power, internal resistance, temperature and other multi-function data measurement and display functions of the device in real time 5The quality of charger batteries can be identified by capacity and energy detection