What Device Is this ?

[Blue Stocking]

Originally Posted by pillum

I'm not sure this is a bilge pump counter at all. Given that it's an old steel boat, I think it's more likely to be an old (hopefully replaced) Impressed Current Cathodic Protection controller.

I'm inclined to agree. Saw one on a steel ferry, looked just like that.

[kjames]

I had the opportunity to take the boat to its new mooring last weekend, with the previous owner. He informed me that it was an old ammeter device - fairly much a custom device made by a friend of his. Thanks everyone for your input. Cheers

[May]

Search google on the internet, you will get the answer.
I also don't know what are they.