Independently tested and certified to meet conditions outlined in us department of defense mil std 810 integral display shield deflects wind and rain test up to 200 mmhr for 1 hour rigid internal frame protects against shocks and drops test drop on flat concrete surface from 61 8 m sealed ports block blown sand and dust test up to 18 msec for 1 hour silicone cladding blocks vibration test 18 hrs at 20 to 2000 hz