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The PS40 scope has all the features of the PS22 but has a 40mm eyepiece/output window, utilizes 3rd, 4th, and WPT generation Image Intensifier Tubes, and is slightly heavier.  The newest technology has been added to the PS40 scopes in the form of White Phosphor Technology (WPT).  This new technology displays the sight picture in black & white instead of green and the resulting resolution enhancement is noticeable.  The sight picture is brighter and sharper with better contrast and depth perception than higher generations of green phosphor sights.
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ATN PS40-2 Night Vision Rifle Scope ATN PS40-CGT  Night Vision Rifle Scope ATN PS40-HPT Generation HPT, Black (Resolution 55-72) Rifle Scope
ATN-NVDNPS4020 ATN-NVDNPS40C0 ATN-NVDNPS40H0
ATN PS40-3 Generation 3, Black (Resolution 64) Rifle Scope ATN PS40-WPT Generation WPT, (white phosphor technology), Black (Resolution 60-74) Rifle Scope ATN PS40-3A Generation 3A, Black (Resolution 64-72) Rifle Scope
ATN-NVDNPS4030 ATN-NVDNPS40WP ATN-NVDNPS403A
ATN PS40-3P Generation 3P, Black (Resolution 64-72) Rifle Scope ATN PS40-4 Generation 4, Black (Resolution 64-72) Rifle Scope
ATN-NVDNPS403P ATN-NVDNPS4040