One for all means one tester can test S9 T9+ S9K S9 SE S11 S15 T15 S17 T17 S19 T19 S19 pro all of them.
We will provide English repair guide for free.
（Important notice: Once flashed 19 series firmware, the board will be locked, can`t switch to test other models any more）
This is a special product, please note that there is no after sale service of this device, no refund or return. Please think carefully before buy.