Measurements can be performed in various ways, either contactless or with contact. The C.A 1727 is equipped as standard with a memory and a USB interface for data evaluation using the Tachograph software. In a contactless optical measurement, a reflective mark is attached to the object to be measured. For contact measurements using accessories, rotational speeds are converted into pulses by a mechanical adapter (cylinder, cone, or measuring wheel), which are then recorded by the tachometer. The digital display shows a bar graph with 42 segments, set functions, alarm thresholds, and more. The 7 measurement units (RPM, Hz, etc.) can be accessed directly via the rotary switch, and each button is assigned exactly one function (MIN MAX, smoothing, alarm thresholds, etc.).