The aim of this study is to verify the safety and accuracy of an FDA-approved device called the NEMO™ Gauge to aide in the proper positioning of the endotracheal tube (ETT), inserted in the lungs of patients admitted to the intensive care unit. The hope is that the NEMO™ Gauge is able to properly determine the correct position of the endotracheal tube without the use of a chest radiograph (chest x-ray). The study investigators anticipate sixty-eight (68) subjects will participate in this study at three (3) study centers in the Inland Empire of Southern California, with subjects being enrolled at Loma Linda University Medical Center, Riverside University Medical Center and Loma Linda Veterans Affairs Hospital.

Inclusion Criteria:

1. Adult patients ≥ 18 years of age admitted to the intensive care unit (ICU)
2. Patients who have been intubated or at high risk of being intubated, requiring confirmation of ETT position after intubation as determined by the clinical team
3. Endotracheal tube size 7.0 mm to 8.5 mm in diameter

Exclusion Criteria:

1. Patients with active hemoptysis
2. Patients with known tracheal or bronchial masses prior to endotracheal intubation
3. Patients with known tracheal or bronchial abnormalities requiring surgical repair

1 year