Welch Allyn/Hillrom SureTemp Plus Oral/Axillary Probe Well for Model 690 and 692Welch Allyn Hillrom SureTemp Plus Oral Axillary Probe Well for Model 690 and 692 The 02891 0000 is a blue probe well (also referred to as a probe well assembly) designed for use with the SureTemp Plus 690 and 692 electronic thermometers. Its specifically used for oral and axillary temperature measurements and aids in reducing cross contamination by being easily removable and color coded. SKU Description Product Key Details Welch Allyn Hillrom 02891