Technical Data:
Accessory type: Interchangeable back cover
Configuration/application: Magnetic Back, Series 3&4 application; magnetic force 10 N

Dimensions:
Back-cover geometry as illustrated for compatible indicator body.
Magnetic force: 10 N

Remark:
Most lugged back covers can be rotated 90 deg because they use four retaining screws. 190561 and 137905 have two retaining screws and their lug orientation cannot be changed. Replacing the back cover of a water-proof model voids the water-resistance guarantee where noted by the catalogue.