Technical parameters: Measuring range: contact type 2 - 19999, non-contact type 2 - 99999 Counting measurement range: 1-99999 0.02% accuracy Resolution: 0.1 or 1 Measuring distance: 50mm-600mm Sampling time: 0.5 seconds (above 120 revolutions) 5-digit LCD display Measurement types: RPM, rotation speed, Hz, speed (m/min, in/min, ft/min, yard/min), and length (m, in, ft, yd) Equipped with laser Backlight function included Maximum, minimum, average, and data hold functions 30 data storage: maximum, minimum, and instantaneous values from 10 measurements Battery: 9V battery (not included) Operating temperature: 0C to 50C Storage temperature: -20C to 70C Color: black Material: plastic Note: Product design may vary slightly between batches; these differences do not affect performance. Package contents: 1 x tachometer 4 x connectors 1 x red protective cap 1 x English manual Only the items listed above are included; other accessories are not part of this package. Note: Lighting conditions and monitor settings may cause slight color variations between the product image and actual item. Measurement error tolerance: +/- 1-3 cm.