NSP-3
The NSP-3 is a night vision device of Soviet origin. Unlike the earlier NSP-2, the NSP-3 is a passive device using a cascade tube. Inside the device (presumably) is a U-32M three-stage cascade tube. The device weighs around 2.7kg. It has a magnification of 2.7x and a field of view of 7°. The device runs on a 4.5 volt accumulator. The whole kit including the bag, crate and accessories weighs around 7.8kg. The device was license produced in Poland and Hungary. The Polish version of the device carries the same NSP-3 designation of the soviet variant, while Hungarian devices are called NSzP-3 (these use U-32M tubes).[1]There are two variants of the device, the NSP-3 and NSP-3A. The NSP-3 carries the 1PN27 GRAU index catalogue number, while the NSP-3As number is 1PN28.[2]
