Mastech MS6208B Digital Tachometer.

MS6208B Digital Tachometer (Photo)

Features:

• Pocket Size
• Photo sensor 
• Auto Power Off
• Data Logging up to 100 groups
• Data Hold and Display Back Light

Specification：

Contact measurement (N/A)
Non-contact measurement (photo)	50~19999RPM ±(0.03%+2)
Measuring distance	50mm~250mm
Auto power off	30s
MAX/MIN/AVG functions	√