contact/laser combination tachometer

DT2236B - Shanghai Glentest Electronics Co., Ltd. (Glentest)

 5 digit large LCD display; Linear surface speed measurement; Measurement range: 2.5 - 99999 rpm(laser mode); 0.5-19999 rpm(contact mode); 0.05-1999.9m/min(contact mode).  Best resolution: 0.1 rpm; 0.01m/min;