1. Take out 2-3 mobile phone screens as samples for this compression test, numbered 1, 2, 3. 2. Put the 1 screen into the glass console of the pressure testing machine. 3. Lower the end of the light beam to a distance of only 5 5- 10/0mm from the screen of the mobile phone. 4. Set the descending speed of the testing machine beam at the software control point. Usually, the descending speed is set to 0. 1 mm/sec/sec. ..