Technical parameters:Measuring range: contact type 2 - 19999, non-contact type 2 - 99999Counting measurement range: 1-999990.02% accuracyResolution: 0.1 or 1Measuring distance: 50mm-600mmSampling time: 0.5 seconds (above 120 revolutions)5-digit LCD displayMeasurement type: RPM, rotation speed, Hz, speed (m/min, in/min, ft/min, yard/min) and length (m, in, ft, yd)With laserWith backlight functionMaximum, minimum, average and data retention30 data storage: maximum, minimum and instantaneous values of 10 measurementsBattery: 9V battery (not included)Operating temperature: 0 to 50Storage temperature: -20 to 70Colour:blackMaterial:plasticTips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect UsePackage Contents:1 * tachometer4 * connectors1 * red protective cap1 * English manualOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.