Ultrasonic measuring unit

A measuring instrument having an ultrasonic measuring unit, wherein the measuring instrument is configured so that it can be arranged on a movement axle of a machine, wherein an ultrasonic measurement can be carried out by means of the ultrasonic measuring unit in the arranged state of the ultrasonic measuring unit on the measuring instrument, wherein the ultrasonic measuring unit comprises a tubular sleeve and a resilient support element, wherein the tubular sleeve encloses the resilient support element, wherein the resilient support element consists of a material that conducts ultrasound waves, wherein the resilient support element protrudes beyond an outer edge of the tubular sleeve at a first end of the tubular sleeve, wherein the tubular sleeve and the resilient support element are intended to directly contact the surface to be measured during a sampling process of the measuring instrument, wherein the measuring instrument has a tactile sensor unit, wherein a sampling event between the measuring instrument and a surface to be measured is detectable by means of the tactile sensor unit, wherein the tubular sleeve is arranged in a manner mounted movably on the measuring instrument, wherein a relative movement of the tubular sleeve relative to the measuring instrument triggers the sampling event.