Meter, in particular hand-held infrared thermometer

In a measuring device, in particular a hand-held infra-red measurement device having an infrared sensor for contactless temperature measurement of an object, as well as with an associated infrared sensor diaphragm device (210) comprising a holding member (220) for placing a pivotable stop (140), wherein the pivotable shutter ( 140) can be arranged in at least a first position in which the infrared sensor is blocked at least substantially by the pivotable shutter (140), and in a second position in which the pivotable stop (140) fully releases the infrared sensor at least substantially, , the holding element (220) at least a sliding surface (212, 214, 216) and the pivotable stop (140) has at least one sliding element (232, 234, 236), which is adapted to (upon pivoting of the pivotable shutter 140) between the first and second position along the at least one sliding surface (212, 214, 216) e.g. u move.