LUTRON DT-2234B

PHOTO TACHOMETER, Model : DT-2234B Range 5 to 99, 999 RPM Resolution RPM 0.1 RPM < 1, 000 RPM 1 RPM 1, 000 RPM Display 5 digits, 10 mm ( 0.4 " ) LCD. Accuracy ± ( 0.05 % + 1 digit ) . Sampling Time 1 second ( 60 RPM ) . Time base Quartz crystal . Photo Tach. detecting distance 50 to 150 mm/ 2 to 6 inch. Typical max. 300 mm/ 12 inch depending upon ambient light. Circuit Exclusive one-chip of micro- computer LSI circuit. Battery 1.5 V AA ( UM-3) battery x 4 PCs. Operating temp. 0 to 50  ( 32 to 122 ) . Memory Last value, Max. value, Min. value. Size 190 x 72 x 37 mm ( 7.5 x 2.8 x 1.5 inch) . Weight 250g ( 0.55 LB) / including battery. Accessories Carrying case 1 PC Reflecting tape marks ( 600 mm) 1 PC Operation manual 1 PC