A common frustration among users is the lack of a physical manual. Many units are sold second-hand or passed between departments without documentation. Here are the most reliable sources:

Avery Berkel has authorized dealers worldwide. They can provide the manual as part of a service contract. This is the best route if you need the advanced Service Manual (which includes circuit diagrams and calibration passwords).

L130 Digital Indicator User Manual | PDF | Calibration - Scribd

They often provide PDF manuals on request for older or specific models.