Specifications: 1. Measuring range: 2.5 - 99999 RPM 2. Resolution: 0.1 RPM at 2.5-999.9 RPM / 1 RPM at 1000 - 99,999 RPM 3. Accuracy: 0.02% + 1 digit 4. Measuring distance: 50 - 500mm (1.96 - 19.6 ) 5. Sampling time: 0.5s (over 120 RPM) 6. Working temperature: 0 to 50 (32 to 122 ) 7. Power supply: via 9V battery Features: 1.Mine hand gun style design 2.Wide measuring range and high resolution 3.Automatic and manual measuring functions 4.Data recording and recall (max. 60 readings) 5.Max/Min/Average recording function 6.Recording time interval setup function 7.White backlit LCD 8.Data hold function 9.Auto and manual power off 10.Low battery indicator 11.CE and RoHS compliant 12.Ideal for applications where a contact tachometer would be unsafe or insufficient. 13.Simply apply some of the included reflective material to the moving part and point the tachometer at it. 14.The tachometer measures how many times the reflective tape passes in a given time and calculates the RPM. Package includes: 1x non-contact laser tachometer 1x reflective foil tape 1x manual