Brand Name: NONE Battery Included: No Certification: CE High-concerned chemical: None Origin: Mainland China Model Number: 771 Length: 10cm/20cm Level bubble: 2/3 Milled surface: Yes Magnetic V-groove base force: 3Kg Accuracy: 0.5mm/m (0.0005"/") Bi-material end caps: Yes FIELDS OF APPLICATION: Carpentry/Plumbing/Decoration ADVANTAGE: Compact/Strong magnet