FDA Product Code FLL: Continuous Measurement Thermometer

Under FDA product code FLL, continuous measurement thermometers are cleared for ongoing body temperature monitoring in clinical settings.

Unlike intermittent spot-check thermometers, these devices provide a continuous temperature reading through sustained contact with the patient — typically via a skin patch, rectal probe, or esophageal sensor — enabling real-time detection of fever onset and temperature trends in critically ill patients.

FLL devices are Class II medical devices, regulated under 21 CFR 880.2910 and reviewed by the FDA General Hospital panel.

Leading manufacturers include Microlife Intellectual Property GmbH, R & D Batteries, Inc. and Taidoc Technology Corporation.