DT2235A
DT2235A Contact Tachometer
, Display: 5 digits, 18mm LCD , Test Range: 0.5 to 19,999 RPM (r/min) , SURFACE SPEED: 0.05 to 1999.9m/min; 0.2 to 6,560ft/min , Resolution: 0.1 RPM (0.5 to 999.9 RPM); 1 RPM (over 1,000 RPM) , Sampling Time: 0.5 sec. (over 120 RPM)