Determine Pregnancy and Backfat and Loin Thickness the Easy Way Provides an analog type display in a digital environment. The digitally enhanced analog display provides a clean, easy to read presentation that can be held on the screen for as long as the user desires. Display provides specific information as to the location of the echoes of interest. For thickness measurements, distance is also given numerically. Microprocessor-based design provides wide flexibility in operating features. Combines many features in an easy to use instrument. The Preg-Alert Pro is a multi-purpose highly versatile A-Mode ultrasonic instrument for performing the following tests and measurements in a wide range of animals: Pregnancy detection in mammals ranging in body size from large rabbits and foxes to cattle and horses. Backfat thickness measurement (in mm or inches) for animals having one, two, or three layers of backfat. Loin muscle thickness measurement (in mm or inches). Uses the appropriate speed of sound factor when measuring fat or muscle. Also measures the thickness of certain other tissues, such as breast thickness in poultry and blubber thickness in some aquatic animals, e.g. the Harbour Porpoise. The Preg-Alert Pro provides all of the features of the former Preg-Alert, as well as many new features. Many of the old features have been greatly enhanced in this microprocessor controlled next generation instrument. The testing process is totally non-invasive, minimizing the chance of infection and disease transmission.