Specifications:
1. Measure Range: 2.5~99,999RPM
2. Resolution: 0.01RPM(3~999).99RPM 
                     0.1RPM(1,000~9,999.9RPM) 
                    1RPM(over 10,000RPM)
3. Accuracy: ±(0.05%+1 digit)
4. Respones Time: ≥1,000RPM, 0.2second 
                            <1,000RPM, 0.5second
5. Memory Function: Single-mode automatic memory maximum, minimun, the last measurement, continuous  mode can record 15000 measuring values.
6. Interface: MINI-USB interface
7. The lens with filter, only receive the red light with specific wavelength and filter the other light effectively 
Measurable speed(RPM), frequency(Hz), Surface speed(m/min),with the accumulated date function.
White backlight LCD. Compalt valuable body.