LUTRON DT1236L 光电接触式转速表

LASER PHOTO/CONTACT TACHOMETER 
Model : DT-1236L 
* Patented, the best tachometer in the world. 
* Long detecting distance for photo Tach. up to 2 meters. 
* Photo & contact tachometer in one meter. 
* Fast sampling time for low contact RPM measurement, automatic reverse display. 
* Photo Tach. : 10 to 99,999 RPM 
Contact Tach. : 0.5 to 19,999 RPM. 
Surface speed : m/min, ft/min. 
* Size : 215 x 67 x 38 mm, patented.