Johnson Level 48"-80" Extendable Box Beam Level (5800-4880B)

Details

Built for durability and accuracy, the extendable box beam level adapts to fit jobs where standard lengths can’t. The telescopic extension customizes the level’s reach, while integrated rulers on both the frame and extension clearly show the total extended length—ideal for measuring and taking inside dimensions. A manual lock-out secures the extension at any desired length for repeatability. The magnified center vial ensures best-in-class visibility, and all vials are triple secured using our patented mounting system for unmatched durability and reliability. For accuracy, both gauging edges are precision-milled on the same plane, maintaining uniform contact across the full extended length.

Builders rely on the extendable box beam level for precise installation of windows, doors, and cabinets, while plumbers value its adjustable design for accurately leveling shower pans and bathtubs of varying sizes.

Key Features

• Telescopic extension adjusts level length eliminating the need to carry multiple levels and adapting to fit custom applications
• Manual lock-out holds the extension at desired length
• Integrated rulers display the level's total length with extension
• Both gauging edges are precision-milled on the same plane for uniform contact along the material’s full length when extended
• Patented, triple-secured vial mounting system provides ultimate durability and guarantees lifetime accuracy
• Hi-visibility impact-resistant plumb vial and magnified center vial

Specifications

• Model: 5800-4880B
• Accuracy: Extended: .001"; Retracted: .0005"; Extended: 1mm/m; Retracted: 0.5mm/m; Extended: 0.057°; Retracted: 0.029°
• Warranty: Lifetime Accuracy Warranty