Trakpower Infrared Temperature Gauge with Stopwatch Displays temperatures in Fahrenheit or Celsius Temperature range of -27 to 428F (-33 to 220C) Stopwatch counts lap times to the nearest 0.01 second Infrared Temperature Gauge with Stopwatch, Nylon Carrying Case and Lithium Battery This gauge accurately measures R/C engine temperatures, but modeler should always refer to engine manual for proper tuning and set-up