The HOT system provides a revolutionary means of monitoring soldiers' temperatures using wireless RF technology. The system includes an RF tag that sends temperature data to a PDA from up to 300 yards away. A sensor measures forehead temperature to estimate core body temperature. It is impact resistant, weighs 14 grams, and takes multiple readings. The PDA software allows medics to monitor temperature trends of up to 1,000 soldiers with alerts and historical data. It benefits soldiers by allowing personal temperature monitoring and medics by notifying them of above-normal temperatures.