Inclusion Criteria:  - Patients from the general ward or the Otorhinolaryngology clinic of Tan Tock Seng Hospital who had an NGT inserted within the last 48 hours and chest X-ray confirming its correct placement  The NGT inserted is a Ryles tube size Fr 14 or 16 COVID negative or not deemed to be infective as judged by the prevailing policies at the time of recruitment Age > or = 21 years BMI < 35 Height < 1.9m Mentally competent for informed consent  Exclusion Criteria:  • Radiological:  On chest X-ray, the length of the NGT distal to the gastroesophageal junction is less than 12cm, or the side-holes of the NGT can be visualized in the esophagus. The NGT is kinked within 10cm of its tip The chest X-ray is rotated such that the thorax is not oriented in the frontal plane The NGT cannot be visualized in the mediastinum  The second intercostal space cannot be visualized on chest X-ray  • Medically unstable:  Heart rate >=100 or <60 Systolic blood pressure >=160 or <100 SpO2 <92% in patients with chronic lung disease and <95% in patients without chronic lung disease  Temperature >= 38 degrees Celsius  • Chest wall deformity:  Patients with pectus carinatum or excavatum, defined by physical examination  • Patients with the following implants  Pacemaker Automatic cardioverter defibrillator Ferromagnetic coronary stents or heart valves Ferromagnetic implants of the cranium, face, spine, sternum or ribs  Ferromagnetic surgical clips or implants in the head, neck, thorax, abdomen or pelvis  • Following conditions within the last 30 days  Upper gastrointestinal bleeding Oesophageal or gastric surgery Stroke Myocardial infarction Aortic dissection  Ruptured aortic aneurysm  Allergy to neodymium, gold, epoxy or nitinol Not able to understand English, Chinese, Malay or Tamil Women whose last menstrual period commenced more than 4 weeks before recruitment unless they have a negative urinary or serum pregnancy test during their current admission.