RPM COUNTER 8270 Revolution Counter realised in cooperation with SIEMENS Germany TECHNICAL FEATURES:- Power supply 12 volt Range 1-9.999 Resolution 1 RPM/MIN. FUNCTIONS One way only to take signal from all petrol and diesel vehicles equipped by every ignition system. The display of data is possible thanks to an easily connection to the battery.Moreover it can be connected to any type of gas analysers and smoke meters of any brands.