Tachometer: 1.Laser typem, 2.Fashion design, 3.Large screen. Tachometer:1.Laser typem,2.Fashion design,3.Large screen. Specification :MEASUREMENT RANGE:2.5~99,999r/minRESOLUTION:0.1/1ACCURACY:±(0.05%n+1d)MEMORY:MAX/MIN/LAST VALUEPOWER SUPPLY:4X1.5V AA(UM-3)BATTERYDIMENSION:145X74X32mm Digital Tachometer