True sense digital lcd laser non contact photo tachometer dt-2234c+ rpm measurer non magnetic with 2.5~99999 rpm rating tachometer testing gauge speed meter tester + carry box + reflective tape photoelectric speedometer high quality digital laser tachometer, speed tester , tachometer black , tachometer digital , tachometer meter , tachometer high quality digital laser tachometer dt-2234c+ non-magnetic engineer's precision level - 8 cm