Mettler Sonicator (IMAGE) Male Contraception Information Project Caption This is the Mettler Sonicator, the ultrasound unit currently used in rat studies. Two applications to the testes 48 hours apart produced long-lasting contraception. Credit Mettler Electronics Corp. Usage Restrictions May be reproduced with appropriate credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.