Breadth Caliper, Martin, 20" Maximum

For a hobbiest on a lathe they are just what I wanted.

Why did you pick this product vs others?: I needed something with a deep reach for measuring wide pieces. This fills the bill with a 10” depth and expands to nearly 19” wide (although without the 10” depth at that spread) As you can see in the photo the depth gauge is misaligned, so the numbers will not be accurate. Close enough for what I’m doing, but if you require precision don’t buy this. It is so cheap that country of manufacturing does not appear anywhere on the gauge. Wow.

As a potter I Iook for accurate calipers without sharp points. This is it. Durable, and somewhat finished surface.

In centimeters, accuracy within 1 centimeter. Maybe useful but not useful for 1/4" accuracy.

I use these for ceramics and have found the contact points for the calipers a little problematic. Only up to a certain degree are the contact points any good for measuring. Passed a certain point, you have to use the point on the extreme south of the caliper contact point face. this is not accurate with the degree markings, but it can be worked around. Beside that, they are sturdy, weighty, and hold their place well when the adjustment screw is tightened. This is not one of those flimsy calipers that lose their place unless you super tighten the wing nut and screw. These are hand crafted, and bear the mark of the forger, caster, or company (not sure which).

Marked only in metric - centimeters and millimeters, even though description refers to inches

The tips did not line up and meet together when closed. The gauge is absolutely worthless. There is some screwed on metal piece that goes between the gauge and the one arm which obscures visibility of the gauge. It's purpose is hard to fathom. There is no screw attachment at the hinge to adjust tension. The thickness of the gauge varies. Just terrible build quality for what is supposed to be a precision instrument.

I got it to measure the OD of trees. Although it does open wide enough it’s not deep enough. It’s not a deal breaker as I can still use it. But would have liked it measure the width and depth as well. The quality of the calipers is good as was the service and time to get to me.