Not pneumatic but hand crank - this is the one I use and it goes up to 46.2"
https://www.amazon.com/VIVO-Adjustable-Standing-Workstation-DESK-M55TB/dp/B089NY945Z/ref=sr\_1\_3\_sspa?crid=38UPRJ9OPFYMN&keywords=hand%2Bcrank%2Bstanding%2Bdesk&qid=1681266274&sprefix=hand%2Bcrank%2Bstanding%2Bdesk%2Caps%2C109&sr=8-3-spons&ufe=app\_do%3Aamzn1.fos.f5122f16-c3e8-4386-bf32-63e904010ad0&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzOE9aR1ZXUjNLS0w2JmVuY3J5cHRlZElkPUEwMzU2NDIzMkw2UTY5WkpLSzUzSiZlbmNyeXB0ZWRBZElkPUEwMDEwNDc2MUFVNTQ1VkdJNDdNTSZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU&th=1