This distancefinder was in used by the army and the airforce. A light frame could be placed on the shoulder so one soldier in the field could use it. Calculatating the distance was not easy and the operator needed a lot of experience to give accurate readings.

In its full length.

One of many instructions on the device.

Instructions for calibrating using a scale (Latte) which was part of the set. Placing it at a distance of 16.40 m, the instrument had to give a distance of 2.350 meter.