1. Resolution size ratio: 0.1RPM (2.5-999.9RPM) 2. Measuring distance: 50-500 mm 3. Sampling rate: 1 time/second 4. Test distance: 50-500mm 5. Time base: quartz crystal 6. Power supply: 3xAAA alkaline batteries (not included in this product) 7. Automatic shutdown: 61 seconds 8. Paul’s last measured value, low battery reminder 9. Good quality and long service life
