The Renco PREG-TONE® is an A-mode ultrasound instrument designed detect amniotic fluid present during pregnancy in mammals.  Detects pregnancy in many small and medium sized mammals.  Major applications: Swine, Ewes, Goats, Alpacas.  The Renco PREG-TONE® has been tested against other ultrasonic pregnancy detection instruments by leading universities throughout the world.  Their studies show it to be the superior instrument, in both accuracy and ease of use.