PregtonePregtone Pregnancy Tester Made by Renco For use on swine, sheep or goats. DO NOT USE ON CATTLE Now easy to set up for animal of choice, no need to send to manufacturer. Includes an animal selection chart showing settings for each animal The patented Preg Tone uses high frequency sound waves called ultrasound to detect amniotic fluid present during pregnancy. When this fluid is detected, the instrument produces a loud continuous tone. When used on an