LUTRON DT 2259 Digital Tachometer & Stroboscope[Feb. 7, 2012 3:28:14]
Specification
Tachometer combine Stroboscope. 2 in 1
Photo Tach : 5 to 99, 999 RPM
Stroboscope : 100 to 100, 000 FPM/ RPM
4 x 1.5 V, AA( UM-3) battery power
Size : 215 x 65 x 38 mm