Sailplane instruments

[Conan Edogawa]

Hey guys, I really need your help!!

I'm searching this variometer, which makes those peeps when climbing or descending. It is a modern instrument of any sailplane nowadays (it should be). Do you have any clue where I can find this gauge? I tried the one from http://www.fszwever.com/, but it didn't wok at all!!

Thanks for any help!