Résumé : Currently, the use of esophageal pH-monitoring is rather limited mainly due to technical difficulties. In addition a nasal electrode for 24 h is often responsible of limitation of activities and reduces the diagnostic value of the test. Telemetric wireless pH-monitoring is now available, avoiding these limitations and offering the advantage of prolonged recordings for 48 h or even 96 h. Consequently diagnostic value is increased, especially due to the more frequent occurrence of symptoms during monitoring. This pH-metric capsule should not be used in patients with increased hemorrhagic risk or in those with pacemaker devices. Inserting the wireless pH capsule during an upper GI endoscopic examination is possible thus reducing hospital visits. Several studies have established the reliability of the technique; in addition the inserted capsule on the esophageal wall makes impossible intragastric migration of the probe sometimes observed with conventional electrodes. Tolerance is good with sometimes some transient chest pain. Overall patients feel more comfortable in their daily activities than with conventional wire electrodes. Finally prolonged wireless pH monitoring makes possible in a unique session both diagnostic and therapeutic characterizations by administering an antisecretory agent at mid recording. Consequently wireless pH monitoring is a valuable alternative to conventional pH-monitoring, especially in patients with intermittent and/or atypical symptoms suggestive of reflux.