Cruising World - - Underway -

I re­ally en­joyed Mr. Sher­man’s ar­ti­cle on saildrives (“Driven to Vig­i­lance,” June 2017). In it, he rec­om­mends “in­stalling a hull-po­ten­tial me­ter on any boat equipped with saildrives.” I’ve searched Google for such hull-po­ten­tial me­ters and have come up blank. Could Mr. Sher­man point me to where I can ob­tain one and per­haps men­tion an OEM? I have a Yan­mar SD and mo­tor in my 2015 Beneteau Ocea­nis 38 and am con­stantly bat­tling cor­ro­sion in the San Fran­cisco Bay ma­rina where she is kept. John Henry, via email Ed Sher­man replies: Pro­mariner sells units — one por­ta­ble and another that can be panel-mounted — for con­duct­ing pe­ri­odic tests. The beauty of th­ese is that you will be able to check rather pre­cisely when you need to re­place an­odes. Th­ese can be found at pro­mariner.com; go to their 2017 cat­a­log, page 39.

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