a cell phone running an application program among others the hardware and software package incorporated into the impact tester 10 and or the software in the hmi will calculate hic fall height gmax maximum velocity and angle of impact based on these inputs as described herein using the onboard sensors 240 as described herein the head impact criteria hic score is determined for a given surface that the impact tester 10 is dropped onto for testing among ways the hic score can be determined is the standard disclosed in astm f1292 section 9 5 and in particular the calculation set out in section 9 5 2 the fall height is the vertical distance the impact tester 10 fell before impact the accelerometers 240 in the impact tester 10 will determine the time when the tester 10 is dropped and starts to fall and when it first impacts the ground and it will use this time to determine the fall height i e u00bd gt 2 where time t is in seconds g is the gravitational constant 32 15 ft s 2 the maximum velocity at impact can be determined by the peak velocity during the drop and can be calculated by multiplying fall time by gravity or v gt where velocity expressed in feet per second and again g 32 15 ft s 2 and time is in seconds as understood by one having ordinary skill in the art this equation can be converted to miles per hour with the following equation other calculations performed by the accelerometers 240 include the angle of impact which is the angle at which the impact tester 10.