Extech vb500 4 channel vibration meter and data logger extech vb500 the extech vb500 4 channel vibration meter and data logger can simultaneously display all four channels on its large backlit display the data logger date time stamps and stores readings at selectable sampling rates of 5 10 30 60 120 300 600 seconds on an sd card in microsoft excel reg format for easy transfer to a pc supplied with 4 x remote sensors magnetic mounts 8 x aa batteries 100 240v universal ac adaptor s