The PREG-ALERT PRO® is a multi-purpose, microprocessor based A-Mode ultrasonic instrument providing a digitally enhanced analog presentation (similar to the Preg-Alert, but with greatly improved readability and ease of use and accuracy). It is used for the detection of pregnancy in most mammals ranging in size from large rabbits to cattle. Also, for the thickness measurement of backfat and loin muscle and for blubber thickness in certain aquatic animals and breast thickness in chickens. It provides all of the functionality of the former world-famous Preg-Alert plus several new features.