A nice and useful device for determining lengths and diameters, which can also find use as a button measure. As small as the caliper is - and therefore perfect for on the road or the on-board tool - it is also solid and durable: made of solid brass, the scale (in inches and millimeters) is permanently stamped in and not just printed on. The small measuring tool measures length, inner and outer diameter to an accuracy of one tenth of a millimeter, but can also be used, for example, as a button measure.