Compact size makes it very convenient for you to carry and store. Simple operation steps make it not waste your time and energy.The LCD display design allows you to see the data more obviously. And the highly accurate testing makes it very reliable and useful.Made of ABS material, it is very durable to use.The length of this product is 10.8cm, the width is 6cm and the height is 3.2cm.It is suitable for speed testing, workshop, electric equipment, industry and so on.Item Name: Laser TachometerMaterial: ABSColor: BlackTime Base: Quartz CrystalPower Supply: 2 x AAA Batteries (Included)Sampling Rate: 0.5 Seconds (above 120 Revolutions)Display: 5-digit LCD Display, Maximum Reading 99,999Operating Temperature: 0 Degree Celsius-50 Degree CelsiusStorage Temperature: -20 Degree Celsius-70 Degree CelsiusMeasurement Resolution: 2.5 rev/min-9999 rev/min 0.1 rev/min 1000 Rpm-99999 Rpm 1 rpmMeasurement Accuracy: +/-0.05% Measurement Value + 1digtalPower Consumption: Under Low-grade Laser Power: About 25mA Under High-end Laser Power: About 40mASize Details: Size: 10.8cm x 6cm x 3.2cm/4.25" x 2.36" x 1.26" (Approx.)Reflective Strip Length: 24cm/9.45" (Approx.)Effective Measuring Distance: 5cm-50cm/1.97"-19.69" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Laser Tachometer1 x English User Manual4 x Reflective Strips2 x AAA Batteries