This replacement lens is suitable for the standard FT50 altimeter from Viplo.
Note: ChutingStar does not stock the FT50 altimeter in the FT50 case that fits this lens. ChutingStar stocks and sells the FT50/FT60 combo altimeter, which is the FT50 internal altimeter in an FT60 casing (which has this screw-in lens). If you do have a complete FT50 altimeter you purchased from Viplo or another skydiving gear shop, this lens will fit. The lens is for the standard FT50 altimeter/casing pops in from the inside of the altimeter and does not screw in.
This is a clear lens. To install, you will need to take off the back plate to remove the altimeter from the inside, pop out the old lens to remove and install the new lens. Then put the altimeter and back plate back together before use.