On your device there is usually a sticker next to the nameplate with a 2D bar code and the serial number (7-digit alphanumeric, i.e. numbers and capital letters).
The serial number on the sticker shown here is only an example!
Suitable products
Cross Laser Level
KCKL 90/4 Set
KCKL 90/4 Set
Cross Laser Level
KCKL 90/4 Set
KCKL 90/4 Set