MODIFIKASI ALAT PERAGA PENGUKUR GETARAN PADA ALIGNMENT POROS MOTOR LISTRIK – GEARBOX – POMPA ( PERGESERAN MOTOR LISTRIK KE SISI KANAN DAN SISI KIRI ) ( MODIFICATIONS VIEWER TOOL GAUGES VIBRATION IN ELECTRIC MOTOR SHAFT ALIGNMENT - GEARBOX - PUMP ( ELECTRIC MOTOR SHIFTS TO THE RIGHT SIDE AND LEFT SIDE )) - Prahestu , Meghananda Dhenta (2015)