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 2、Resistance 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 4、High 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 5、The quality of charger batteries can be identified by capacity and energy detection Features: 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 3. Quick identification, able to identify patterns QC2.0 and QC3.0 5. The quality of charger batteries can be identified by capacity and energy detection 7. Help interface. The product comes with a help interface in both Chinese and English. If you encounter problems in use, you can view the help interface 8. The screen supports four-way rotation 9.1.44 "LCD LCD screen, 6 kinds of dazzle color measuring interface, multi-directional Angle conversion 10.After the phone connects to the APP, the detected data can be saved as an EXCEL table, which is convenient for users to view the complete data Specification: Product Model:UM34/UM34C (Optional) Display screen:1.44 Inch color LCD display Current measurement range: 0-5.0000A Current measurement resolution: 0.001A Capacity accumulation range: 0-99999mAh Energy measurement range: 0-999.99Wh Current measurement accuracy: ±（0.8%+3digits） Load impedance range: 0.8Ω-9999.9Ω Time measurement range:0-99h59min59s Temperature range: -10℃~100℃/0℉~200℉ Temperature measurement error: ±3℃/±6℉ Screen brightness setting: 0-5 levels Auto screen off time: 0-9mins Current graphing range: 0-4.000A Refresh rate:2Hz Size: 7*3cm/2.8*1.2in Weight: Approx.48g~53g/1.7oz~1.9oz Note: 1. UM34 has no communication version and does not support any communication between PC and mobile phone in any case. UM34C is the communication version connected via bluetooth. UM34C does not have PC software, only phone applications. 2.Mobile phone 5.0 and above, support 18 languages, Chinese, English and Russia... ) 4. Some phones are not compatible with our bluetooth board, please buy them carefully, Not suitable for NOTE8 / S8 5.Apps: A: the APP only supports 5.0 and above. B: allow the application to run in the background without cleaning up. C: allow applications to self-start. D: keep the application running after the lock screen. Don't clean it up. E: type-c is only used to measure, not support all types -c quick charge, not trigger. Package list: 1 x UM Tester Meter 1 x box