![]() An infrared filter and a diaphragm (for adjustment of the signal strength) is mounted inside the receiver optics. The EDM consists of two telescopes, a transmitting telescope and a receiving telescope with objective diameters of 28 mm each. The adjustment of the distance meter's line of sight (to that of the theodolite) was with the aid of these screws, on the eyepiece side. It is pressed on these screws by springs on the other side. The distance meter slots into holes on the objective side and rests on adjustable screws on the eyepiece side. This Kern DM 501 short-range electro-optical distance meter has the ability to conveniently snap on to the telescope of a Kern theodolite such as the Kern K1-SE scale-reading theodolite as shown in the above images, thus producing a complete all-in-one theodolite and distance measuring instrument (see 0215 for details on the host theodolite). Length 180 mm, Width 70 mm, Height 180 mm
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