The combined tachometer-stroboscope is a measuring device designed for use in maintenance, servicing, and production. In addition to its stroboscope function, the tachometer-stroboscope also has the capability to measure rotational speeds contactlessly and to measure temperatures. This makes it ideal for testing the rotational speeds and temperatures of centrifuges, motors, fans, and many other machines and systems used in industry and research. The unique feature lies in the combination of these measurement parameters in a single housing. The tachometer-stroboscope has a measurement range of 0.5 to 99,990 RPM. Thanks to the IC circuitry and a bright red LED lamp, the device has low power consumption and is virtually maintenance-free. The settings for the tachometer-stroboscope are made via push buttons for coarse and fine adjustments. Additionally, the tachometer-stroboscope allows for non-contact measurement of rotational speeds from 0.5 to 99,990 RPM with a resolution of up to 0.5 (for n < 1,000 RPM). When set for contact speed or rotational speed measurement, the display is rotated 180°, allowing for easy reading of the values.