The MAHLE EmissionPro RMU?300 is a versatile, Bluetooth-enabled tachometer for petrol and diesel engines. It measures engine RPM via alternator signals, a magnetic vibration sensor, or via an optional EOBD?300 interface, and can also read engine temperature using a standard sensor. Its built-in rechargeable battery allows cordless operation, and Neural Network filtering technology helps reduce measurement noise and improve accuracy.