This tachometer is a high quality instrument to measure the Rotational Speed (RPM) with wide measuring range and high resolution. It is featured with high accuracy measurement, quick measuring time and long detecting distance up to 500 mm (20 inch) with Laser.This tachometer is very easy to use by applying a reflective mark (included in package) on target object, then aim at the mark by Laser beam.This tachometer has wide range of applications include measuring rotating speed of machine, motors, model car, wheels, lathe for metal or wood cutting work etc.Display: 5 digits, 18 mm (0.7 inch) LCD with Function Annunciation.Testing Range: 2.5 - 99,999 RPM (rate or min).Resolution:0.1 RPM (2.5 - 999.9 RPM) .1 RPM (over 1,000 RPM).Accuracy: (0.05 percent and 1 digit).Sampling Time: 0.8 seconds (over 60 RPM).Test Range Selection: Automatic.Memory: Maximum value, Minimum value and Last Measured value.Detecting Distance: 50 - 500 mm (2 - 20 inch) (Laser).Time base: Quartz Crystal.Circuit: Exclusive one-chip of minicomputer LSI circuit.Power: 9V 6F22 BatteryOperating Temperature: 0 - 50 C (32 - 122 F).Dimension: . 131 (L) x 70 (W) x 29 (D) mm (5.16 x 2.76 x 1.14 inch).Weight: . 160gColor: Orange and BlackMaterial: plasticPackage Content:1 x Digital Tach1 x battery1 x Carrying Bag(Blue)