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PCB PIEZOTRONICS 394B05 HANDHELD PORTABLE SHAKER for ACCELEROMETER TEST #95ft-88 Vibro-Meter AO AMERICAN OPTICS VINTAGE 44XPCB PIEZOTRONICS 394B05 HANDHELD PORTABLE SHAKER for ACCELEROMETER TEST #95 ft 88 This portable shaker operates only when the power button is depressed, it is an early version. Thanks.