Vibration meters allow for the precise determination of the level of vibration in whatever is being tested, which is a useful guide in guaranteeing the proper balance, alignment, and general condition of pumps, motors, and other machinery. Poor balance, misalignment, and looseness result in higher levels of vibration. These hardy devices—water- and dust-resistant in some models—come ready to use. Many models can hold data from previous measurements for easy comparison of vibration levels.