Blue Sea 8239 AC Digital Frequency Meter [8239] Marine Plumbing & Ventilation Dimensions with sun cover (HxWxD):

Dimensions with sun cover (HxWxD): 115 x 120 x 35

you easily can expand your system using the same standard data cable to plug additional units and displays into the GMS 10 network ports

The mesh back allows the breeze to cool you on hot days

If your boat falls between two pilot types

Blue Sea 8239 AC Digital Frequency Meter [8239] Marine Plumbing & Ventilation Dimensions with sun cover (HxWxD):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)