Measuring flex shaft with a caliper

[Tony]

Hi guys . I just bought a digital caliper from HomeDepot. I'm trying to figure out what size flex shaft i have in my boat. So how do i measure the flex shaft cable to see if its .150 or .130? I measured the diameter of the flex shaft cable, and its 17.53 mm Please

[sailr]

Your caliper should be switchable to mm or inch! If not, take it back. Go to Harbor Freight. The caliper will be a lot cheaper there. Are you sure about that reading? 17.53mm is .69" ! That's huge! Did you zero the caliper before you measured? .130 would be 3.302mm and .150 would be 3.81mm

[Tony]

Yea, it is switchable to mm, inch, and fraction. I closed it , and zero the caliper. The new measurement is 3.69mm, and 0.14 50in. So. Does this mean its a .150 flex shaft cable?