Nonin Soft Reusable SpO2 Sensor - Small, Model 8000SS-3, 3mReusable soft rubber finger sensor for Nonin pulse oximeters. Digit thickness: 7. 5 to 12. 5mm Preferred application: Fingers, Toes Quick & easy spot checking Comfortable fit for continuous monitoring Durable design & easy to clean Universal sensor for many settings Suits the following devices; Nonin 2500, 2500A, 7500, 8500 Welch Allyn Connex Spot Vital Signs (with Nonin module) Various sleep monitors utilising the Nonin oximetry module 2 year warranty