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The KLEIN TOOLS 901-6 is a folding wood rule designed for accurate linear measurements on flat or elevated surfaces. At 6 feet in total length, it unfolds in rigid sections that hold position without a locking mechanism, making it well suited for situations where a flexible tape measure is less practical. The outside-reading scale lets technicians read measurements from the outer edge of the rule, a common requirement when measuring inside openings such as door frames, pipe chases, or conduit runs. This tool is built for trade professionals who need reliable, repeatable measurements in the field.
The 901-6 is appropriate for residential and commercial job sites across multiple trades. Electricians use folding rules to measure conduit runs and panel clearances. Plumbers rely on them for pipe layout and rough-in dimensions. HVAC technicians find them useful for measuring duct openings, unit clearances, and equipment footprints. The rigid-section design is particularly useful on elevated surfaces such as ladders or scaffolding where a retractable tape may be difficult to control.
Designed as a general-purpose folding rule for trade professionals across electrical, plumbing, HVAC, and related construction applications.
No installation is required for this hand tool. Unfold sections fully and sequentially to avoid stressing the joints between segments. Inspect the hinge joints periodically for cracks or looseness, and replace the rule if any section fails to lock rigid during use, as a flexing joint will produce inaccurate readings.
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