Principle of  detector determines pregnancy by locating amniotic fluid in the uterus. It uses the phenomenon of ultrasonic wave reflection. When pressed to the animal’s skin, the probe sends an ultrasound beam which is reflected from uterine horn filled with fluid and returns to the probe, causing a change of signal generated by the device. An optimum day of examination depends on the animal species and is calculated from the date of mating or insemination. It is necessary to repeat the test at an optimum date, if a very early pregnancy was checked. The set includes: DRAMIŃSKI PDP ultrasound pregnancy detector,2xBNC connecting cable, ultrasonic probe, bottle of liquid paraffin,1 x 9V 6LF-22 type alkaline battery,