Mettler Sonicator (image) Male Contraception Information Project Share Print E-Mail 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. Share Print E-Mail 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.