Starrett 49501 Electronic Drop Indicator 1 Inch Range

Product Description

The STARRETT 49501 is an electronic drop indicator designed for precision dimensional measurement in machine shops, fabrication environments, and maintenance settings. It delivers a measurement range of 1 inch with an accuracy of 0.0001 inches and a resolution of 0.00005 inches, making it suitable for surface variation checks, runout measurements, and part inspection tasks. The unit features an LCD display for clear readout and ships with a flat back included. Power comes from two CR2032 3V lithium batteries, which are included. Installation and setup require no special trade licensing, but the instrument is commonly used by machinists, tool-and-die workers, and precision maintenance technicians.

The STARRETT 49501 is used in applications where electronic readout is preferred over dial-type indicators. Typical use cases include checking shaft runout, surface flatness, and part-to-part variation on milling machines, lathes, surface plates, and inspection fixtures. The flat back design allows the indicator to be mounted in standard dovetail holders and magnetic base assemblies. Dual-unit readout supports both inch and metric measurements, making it adaptable to mixed-standard workflows in manufacturing and maintenance environments.

Key Features

• 1 inch measurement range with 0.0001 inch accuracy and 0.00005 inch resolution
• LCD display provides clear digital readout in inch or metric units
• Flat back included for compatibility with standard dovetail-style holders
• Powered by two CR2032 3V lithium batteries, included in the package
• Dual-unit display supports both decimal inch and millimeter readout

Compatibility

Designed as an OEM-style drop indicator for use with standard dovetail mounting holders and magnetic base indicator arms commonly used in machine shop and maintenance inspection setups.

Installation Notes

The STARRETT 49501 is mounted by a licensed machinist or precision maintenance technician using a dovetail holder or equivalent clamping fixture. Ensure the mounting arm and contact point are secure before taking measurements to avoid false readings. Replace batteries when the low-battery indicator activates to maintain measurement accuracy. Handle the stem and contact point with care to avoid damage that could affect calibration.