Electronic, mine came with a stick on reflector and every rotation is counted as it passes the reflector. There are several out there that I'm aware of, any should give you good comparison numbers so you could corrolate RPM/AMP DRAW/SPEED..
--- On Wed, 6/3/09, Paul C. Smith <paul136mc@yahoo.
From: Paul C. Smith <paul136mc@yahoo.
Subject: Re: [Electric Boats] Re: Electric power for over 30' [Question for Dave K]
To: electricboats@
Date: Wednesday, June 3, 2009, 4:32 AM
Thanks Dave.. The hand held tech, is it mechanical, electronic? How would you make it work on say, a propeller shaft?
Best Regards,
Paul <paul136mc@yahoo.
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