When taking a temperature orally or rectally with a digital thermometer, a probe cover can act as a barrier to prevent the temperature from escaping and to keep the device clean. A dirty probe can throw off infrared thermometer readings, therefore cleaning the device between uses is essential. Don't reuse disposable covers, use a fresh one each time. After using the thermometer, simply toss the disposable cover in the trash and wash the device. These are essential pieces for any thermometer use because they prevent the spread of germs and bacteria between patients. Our package of thermometer probe covers is an excellent deal considering the volume of covers that you receive.