Blue Sea 8239 AC Digital Frequency Meter 
AC Digital Frequency Meter
- Displays frequency from 40 to 90 Hertz
- 3 levels of display brightness
- Splashproof front
WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.
Owner's Manual (pdf)