This handy compact map measurer from the Polish Military is ideal for calculating distances on OS maps at 1:25k, 1:50k or 1:100k scale.
The instrument features a precision measuring wheel with scales of 1:25,000 and 1:100,000 on the reverse. To use on a 1:50k map simply simply double the value recorded on the 1:25k side (or half that on shown at 1:100k).
A great example of vintage military navigation equipment in excellent new condition.
Available in either a brown or black case.
At only 25g, including the case, it's perfect for use out on the hills.