Tool for non-contact measuring of model speeds with a photoelectric beam sensor. The data is transmitted from the sensor to the display unit by radio waves (433 MHz). Up to 16 sensors can be managed by a measurement tool. The unit has an easy to read liquid crystal display with the option of showing the actual speed, maximum, and minimum speed. There is a display of the scale, optional settings for m/s, mph and km/h, and a display of the address of the sensor. There is an additional display of the laps run. Sensor circuit board approximately 80 x 50 mm / 3-1/8" x 1-15/16". Display unit approximately 80 x 70 x 120 mm / 3-1/8" x 2-3/4" x 4-3/4". Operation 4.5 volts (3 x 1.5 volt penlight battery).