Fowler 54-520-255-0 Electronic Drop Indicator 0-0.5 in

Product Description

The FOWLER 54-520-255-0 is a digital electronic drop indicator designed for precision dimensional measurement in machine shop, metrology, and quality control environments. It measures linear displacement from 0 to 0.5 inches (12.50 mm) with a resolution of 0.0005 inches (0.0100 mm), making it suitable for applications where fine measurement accuracy is required. The lug back mount allows rigid fixture attachment to magnetic bases and indicator holders. The solid carbide contact point resists wear during repeated gauging cycles. This indicator is part of the Fowler X Series and is installed and used by machinists, quality technicians, and toolroom professionals.

This electronic drop indicator suits precision measurement tasks in manufacturing and inspection settings. It functions in both inch and metric modes, supporting shops that work in mixed measurement systems. The digital display eliminates parallax error common with analog dial indicators, providing clear readings in tight workspaces. Typical applications include runout checks, surface flatness verification, bore alignment, and fixture setup on mills, lathes, and surface plates. The CR2032 battery powers the unit for extended measurement sessions without frequent interruption.

Key Features

• Digital display with 0.0005-inch (0.0100 mm) resolution for fine-tolerance measurement
• Measurement range of 0 to 0.5 inches (0 to 12.50 mm)
• Solid carbide tipped contact point for extended wear life
• Lug back design for secure mounting on standard indicator holders and magnetic bases
• Dual-mode readout in both inch and metric units
• 3/8-inch (0.3750 inch) stem diameter for compatibility with standard indicator mounting hardware
• Powered by CR2032 coin cell battery

Compatibility

Designed as a drop-style replacement or upgrade indicator for standard 3/8-inch stem indicator holders, magnetic bases, and back-plunger style fixture setups used in machine shop and metrology applications.

Installation Notes

Installation is performed by machinists or quality technicians using a standard indicator holder or magnetic base that accepts a 3/8-inch stem. Ensure the mounting clamp is tightened securely against the stem to prevent indicator movement during measurement. Verify the contact point is perpendicular to the surface being measured to avoid cosine error in readings. Do not exceed the stated measurement range, as over-travel can damage the internal sensing mechanism.