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With the Small Plumb Bobs for physical science and physics, accurately measure tilt angles for inclined planes or projectile launching devices.

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Accurately measure tilt angles for inclined planes or projectile-launching devices with these inexpensive plumb bobs. Simply tie the plumb bob to a string and secure the string to the angled apparatus. Then, measure the angle between the vertically hanging string and the instrument using a protractor. Available in two sizes: ½ oz and 1¾ oz. Sold in packages of 12.