Omron TH839S Ear Thermometer Probe Covers are suitable for the Suitable for Omron TH839S Ear Thermometer. The benefits of these ear probes are: Replacement Probe covers. Pack of 40. Includes applicator ring. Latex free. Attach probe cover to Ear Themrometer prior to taking a measurement as per instructions in manual. Replace as necessary. Always read the label. Use only as directed.