ADscope 665 The first disposable stethoscopes with performance so good you might want to keep. The 665 features a nurse style diaphragm only single patient use scope. Acrylresin construction throughout is super lightweight. Non-toxic. May be ETO sterilized and safely incinerated. Weighs 1.5 oz. for comfort, yet is remarkably durable. Ultra-sensitive diaphragm for outstanding acoustic performance. Individually packaged in a sealed polybag.