GM8905 Handheld Digital Laser Tachometer Range 2.5-99999RPM.

5-digital LCD with 18mm character in height
2. Unit: rpm
3. Measuring range: 2.5-99999rpm
4. Resolution: 0.1rpm (2.5-999.9rpm); 1rpm (1000-99999rpm)
5. Basic precision: +/-(0.1%n+5d)rpm, (2.5-999.9rpm); +/-(1%n+5d)rpm, (1000-99999rpm)
6. Laser power: CLASS II 2-5mW
7. Sampling rate: 1second/time
8. Measuring distance: 50-500mm
9. Time base: Quartz crystal