The invention relates to opto-electronic instrumentation, particularly to instruments for measuring optical characteristics of the atmosphere, it can be used to measure the distance from the ground to the cloud and is used in airports, weather stations for meteorological Aviation.; The object of this utility model is to simplify the device construction, reduction in size and increase in detection range. The problem is solved thanks to the fact that the receiver-transmitter unit meter of cloud comprising optically coupled with the laser source and forming optical system and radiation receiver, in contrast to the prior art forming optical system comprises an optically associated first and second lenses, between which the at 45 ° to the optical axis of the flat mirror having a central opening, wherein the radiation receiver is optically coupled to the second lens by a plane mirror, wherein the first lens comprises two single positive lens, the first being convex-concave, facing the concave surface to the radiation source, the second - biconvex, and the second lens comprises three single lenses, the first of which is positive convexo-concave facing concave surface to the radiation source, the second - a negative convex-concave, a convex surface facing the radiation source, the third - the positive biconvex.
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