Starrett 49503 Electronic Drop Indicator 4 Inch Range

Product Description

The STARRETT 49503 is an electronic drop indicator designed for precise dimensional measurement in machining, inspection, and metrology applications. It delivers a 4-inch measurement range with an accuracy of 0.0002 decimal inches (0.004 mm) and a resolution of 0.0001 decimal inches. Readings are displayed on a clear LCD screen, making it easy to read in both inch and metric units. The flat back design allows the indicator to mount flush against a surface plate, magnetic base, or fixture arm. It ships with two CR2032 3V lithium batteries included and is ready to use out of the box.

This indicator is suited for machine shop environments, quality control benches, and precision fabrication settings where a wide measurement range and high accuracy are required in a single instrument. The 4-inch range accommodates larger workpieces and deeper bore measurements that shorter-range indicators cannot handle. It is appropriate for use by machinists, metrology technicians, tool and die makers, and quality assurance personnel working in both production and job shop environments.

Key Features

• 4-inch (100 mm) measurement range for larger workpieces and deeper measurements
• Accuracy of 0.0002 decimal inches (0.004 mm) for reliable precision work
• Resolution of 0.0001 decimal inches for fine incremental readings
• Dual-unit LCD display reads in both inch and metric (mm) modes
• Flat back included for flush mounting on surface plates and fixture arms
• Battery-powered with two CR2032 3V lithium batteries included

Compatibility

Designed as a drop-style electronic indicator compatible with standard indicator holders, magnetic bases, and fixture arms that accept a flat-back indicator body. Consult your mounting hardware specifications to confirm fitment before installation.

Installation Notes

Installation and setup is typically performed by machinists or metrology technicians. Mount the indicator securely in a compatible holder or magnetic base before taking measurements, ensuring the spindle axis is aligned perpendicular to the measurement surface to avoid cosine error. Do not overtighten the clamping collar against the indicator body, as this can affect spindle travel. Replace batteries when low-battery indication appears on the LCD to maintain measurement accuracy.