An assembly of devices which includes a main computerized unit designed to evaluate peristaltic motility in the gastrointestinal tract by measuring pressure using an intraluminal sensor catheter/probe at several points; it may also measure pH, respiration, and swallowing with appropriate sensors. In addition to the central computer with software it may includethe appropriate perfusion and/or nonperfusion catheters. It is intended to evaluate patients with dysphagia, gastro-oesophageal reflux disease (GERD), noncardiac chest pain, and/or assess connective tissue and neuromuscular disease.