Utilizing a radio wave signal, the Remote Sensor(s) will measure the temperature at the waterproof probe tip and send the information to the Pinpoint Temperature Display Monitor, which will display the temperature in Fº or Cº degrees. The PinPoint Wireless Thermometer can accept a maximum of 4 remote sensors--expanding the monitoring capability to 4 different locations to be displayed on the same Pinpoint Temperature Display Monitor. The American Marine Pinpoint Wireless Thermometer System comes with one remote sensor. More Pinpoint Remote Sensors can be purchased.