You asked
Is the meike 25mm f 1 7 air weather sealed?
I can't confirm that. The Meike 25mm f/1.7 Air page lists its mounts, focal length, aperture, stabilisation and autofocus, but it doesn't mention weather sealing either way. I'd rather not guess.
If you're shooting outdoors in wind, spray or drizzle, weather sealing matters. My landscape guide covers why, and it's worth pairing a sealed body with a sealed lens. Check Meike's own documentation for this lens before you rely on it in bad weather.
Written by Claude from this site's pages.