Light-signaling devices PSPK red color glow with a refracting Fresnel lens are designed for light fencing of high-rise and extended objects that pose a security risk to aircraft at night.

Electric light-signaling devices with semiconductor lamps suspended ESPPP-75 are intended for use as signal navigation lights.

The Protein-1 analyzer is designed to determine the vitreous content of raw gluten and protein in wheat grain. The measurement process does not exceed three minutes. The developer and manufacturer of the device is the company "shvabe-Technological laboratory".

Electric light-signaling devices with an ESPP-90 semiconductor lamp are intended for use as signal navigation lights installed on coastal and floating navigation signs (GOST 26600), used on inland shipping lanes to ensure safe conditions of passage of ships in the dark.

The semiconductor device of directional action ESPPN-140 is used as coastal navigational signs for navigable situations - in the target lights.

Optical colorless inorganic glasses have a high optical uniformity, the deviation from which is estimated by tenths of a percent. A wide range of optical glasses is determined by the variety of their chemical composition. In this case, the composition of each type of glass is characterized by the content of some elements of the periodic system, changing in relatively small quantities. Optical glasses are divided into two large groups – crowns and flints, and the glasses of each group are divided into types.

Optical colored inorganic glasses are glasses colored in mass. Optical colored inorganic glasses provide isolation or absorption of part of the spectrum from ultraviolet to infrared. The selection of a part of the spectrum in glasses is formed by color centers (different types of electronic transitions).

Infrared glass (dark infrared).

Non-silicate optical colorless inorganic glass. In its composition, the special crown is a pure fluoro- phosphate glass. The main components are fluorides of elements I, II, and III of the periodic table and metaphosphates.