During testing, no lights are used, no buttons are pushed, thus attention is not diverted from the animal. A short, intermittent tone indicates good contact. When amniotic fluid is detected, the instrument produces a loud continuous tone. When used on an animal which is not pregnant, the instrument continues to produce the intermittent recurring tone. The Preg-Tone is most accurate early in gestation, usually between 30 and 45 days.
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