Carpenter's corner square Proline 5212306 30 cm — right-angle layout and marking tool

Corner square Proline 5212306 is a carpenter’s layout tool combining a movable aluminium ruler, spirit level, scribe and adjustment screw. The aluminium ruler has a double-sided scale on both edges and a thickness of 18 mm, with a total length of 30 cm. The tool measures external and internal 90° angles and provides depth measurement up to 300 mm. The included scribe enables marking and tracing on metal surfaces.

Advantages

The movable aluminium ruler allows precise measurement of both internal and external right angles. A built-in spirit level ensures quick alignment, while the adjustment screw secures the ruler in place for repeated measurements. The double-sided scale on the 30 cm ruler gives readings from either edge, and the metal scribe simplifies marking on workpieces.

Suitable for

• Carpentry and joinery layout work
• Measuring and marking 90° angles on wood and metal
• Depth measurements up to 300 mm
• On-site adjustments and repeated angle checks

Key specifications

• Brand: Proline
• Model / MPN: 5212306
• EAN: 5903755212306
• Type: Carpenter’s corner square with movable ruler
• Ruler material: Aluminium
• Ruler length: 30 cm
• Ruler thickness: 18 mm
• Scale: Double-sided on both edges
• Angle measurement: 90° external and internal
• Depth measurement: up to 300 mm
• Included: Spirit level, metal scribe, adjustment screw

How to use

Position the aluminium ruler against the workpiece and adjust the movable arm to form the required external or internal 90° angle. Use the adjustment screw to lock the ruler in position for marking or repetitive measurements. Use the built-in spirit level to verify alignment. For depth measurements, extend the ruler and read the depth on the scale up to 300 mm. Use the metal scribe to mark cut lines or tracing on metal surfaces.

Usage recommendations

Keep the ruler and scribe clean of debris and metal filings; tighten the adjustment screw before transferring measurements; store in a dry place to prevent corrosion of the scribe. Use gentle pressure when scribing on finished surfaces to avoid undesired scratches.