Shock tests are used to accurately measure the fragility of products and to evaluate protective packaging.  Shock test data is key information necessary to ensure that any product is capable of with standing its 'real world' environment. Packages and products must be evaluated for their ability to withstand hazards of transportation.  Shock occurs to a package or product when there is a change in velocity.  When the package is dropped, the velocity immediately changes, therefore inducing shock. During shock testing, accelerometers are placed on the critical components of the package or product.  The test specimen is then dropped from a pre-determined height according to the ASTM standard D3332.  Drop shock testing assesses how well the package is protecting the product inside or the fragility and durability of the product.