01-02-2017, 05:07 PM
The digital non-contact type is fine. Write down the speed at 3 or 4 places on the dial, and you should be fine.
Mike
SB 10K (1976) Rockwell vertical mill (1967) Rockwell 17" drill press (1946) Me (1949)
SB 10K (1976) Rockwell vertical mill (1967) Rockwell 17" drill press (1946) Me (1949)