Spi 11-983-4 Digital Protractor Magnetic Base

Product Description

The SPI 11-983-4 is a magnetic base digital protractor designed for precise angle measurement in trade and industrial applications. It measures angles from 0 to 90 degrees with a resolution of 0.05 degrees and an accuracy of 0.2 degrees, making it suitable for work that demands reliable angular readings. The integrated magnetic base allows the unit to attach securely to ferrous surfaces, keeping hands free during measurement. A 9V battery is included. This instrument is commonly used by machinists, pipefitters, HVAC technicians, millwrights, and other trade professionals who require accurate angle verification during fabrication, installation, or alignment work.

The 11-983-4 is well suited for layout and verification tasks in both shop and field environments. Its compact footprint — 2.2 inches in length, 2.2 inches in width, and 1.2 inches in height — allows use in tight spaces where larger instruments cannot fit. The magnetic base makes it practical for attaching to ductwork, pipe, structural steel, and machined surfaces. It is appropriate for both residential and light commercial trade applications wherever precise angle confirmation is required.

Key Features

• 0 to 90 degree measuring range with 0.05 degree resolution
• Accuracy rated at 0.2 degrees
• Integrated magnetic base for hands-free attachment to ferrous surfaces
• Digital readout for fast, unambiguous angle readings
• Low battery warning indicator
• 9V battery included — ready to use out of the box

Compatibility

Designed for general-purpose angle measurement tasks on ferrous surfaces in trade, industrial, and fabrication settings.

Installation Notes

This instrument does not require installation but should be handled and stored in accordance with manufacturer guidelines to preserve calibration accuracy. Before use, ensure the magnetic base and the mounting surface are clean and free of debris to achieve a secure, level connection. If used in environments with strong electromagnetic fields, verify readings against a secondary reference. Calibration should be checked periodically according to your shop or job-site quality standards.