Phoenix Engineering RoadRunner digital turntable-platter speed-readout 100-240v This product is designed, manufactured and shipped from the USA. The RoadRunner is a microprocessor controlled digital tachometer used for monitoring turntable platter speed to 3 decimal places of resolution. The tachometer uses a hall effect sensor and a small magnet attached to the underside of the platter to sense the platter rotation. Built-in accumulated playing time counter