List five engineering controls in the stm/afm room and one control that you wear to protect equipment and samples. some of them are on the stm/afm test from two years ago. what is each of their purposes? describe the effects of improper use, abuse, or failure to use each of these engineering controls. for example, when i started this lab course, i put sand inside rubberized horse feeding troughs, and then put cocktail tables in the sand. that primitive system has been replaced, but it had a purpose at one time.