Device to measure an embryo's heart in an egg

Device (1) for contactless measuring of an embryo's heart rate in an egg (2) whereby infrared light (5) is sent in the egg (2) by one light source (4), and the reflection of that light (5) is detected by one or more light sensors (7) and converted into a signal that is representative for the heart rate, the device comprising a light source (4), one or more light sensors (7) and shielding means (9) to avoid light that is reflected on the egg shell (2) interfering with the light sensors (7), wherein the shielding means is provided at the light source (4) and not at the light sensors (7), by means of a light tube (9) provided between the light source (4) and the egg (2), whereby the light tube (9) is internally dimensioned and positioned such that a focused light spot is directed on the egg (2), and the light tube (9) is dimensioned and positioned such that light reflected on the surface of the egg (2) on the level of the light spot cannot directly reach the light sensors (7).