Which iPad series do you have?

Including:
Mini 1 / Mini 2 / Mini 3 /
Mini 4 / Mini 5

Including:
iPad 2 ('11) / iPad 3 ('12) 
iPad 4 ('12) / iPad 5 ('17) 
iPad 6 ('18) / iPad 7 ('19)
iPad 8 ('20) / iPad 9 ('21)

Including :
Air 1 / Air 2
Air 3 / Air 4

Pro '15 10.5" / 12.9"
Pro '17 10.5" 12.9"
Pro '19 11" / 12.9"
Pro '20 11" / 12.9"