How big is Nima? Stacy Boise July 01, 2017 08:04 Follow The Nima sensor is totally portable (about the size of a deck of cards), small enough to fit in a jacket pocket, and weighs only about 3 ounces. Visit the Nima store. Related articles What material is Nima made from? How long does the test take? Comments 0 comments Please sign in to leave a comment.