What Are Digital Tachometers Used For? Digital tachometers can use a pulse that senses the revolutions of the object, resulting in a number you see in a digital readout. Digital tachometers can also use optical sensors like a laser or reflective tape to measure rotations of an object. Find a Digital Tachometer For Motorcycles? Do you still can't find the exact Digital Tachometer supplier? Discover all the information about the product - Digital Tachometer. Choose Quality Digital Tachometer from HisTest.com now!