Starrett 12273 Electronic Outside Micrometer 127 Mm

Product Description

The STARRETT 12273 is an electronic outside micrometer designed for high-precision dimensional measurement in professional metrology, machining, and quality-control applications. It covers a measurement range up to 127 mm (5 inches minimum to 6 inches maximum) and delivers a resolution of 0.0001 decimal inches with an accuracy of 0.00015 decimal inches. The measuring faces are micro-lapped carbide, providing a hard, wear-resistant contact surface suited to repeated use in shop environments. A friction thimble gives the user consistent measuring pressure, and a ring-style lock nut holds the spindle position for readout transfer. A CR2450 battery is included.

This micrometer is used in precision machining shops, tool rooms, and quality-assurance settings where outside diameter or thickness measurements in the 5-to-6-inch range must be verified to sub-thousandth tolerances. It is appropriate for machinists, toolmakers, metrology technicians, and quality inspectors working to tight blueprint tolerances on shafts, bores, tooling, or finished components.

Key Features

• Resolution of 0.0001 decimal inches for sub-thousandth readout
• Accuracy of 0.00015 decimal inches across the full range
• Micro-lapped carbide measuring faces resist wear and maintain flatness over time
• Friction thimble provides repeatable, consistent measuring force
• Ring lock nut secures the spindle for stable readings
• Black wrinkle and satin chrome finish; CR2450 battery included

Compatibility

Designed as a standard outside micrometer for general outside-dimension measurement in the 127 mm range; compatible with any application requiring a 5-to-6-inch electronic outside micrometer with a standard thimble-style interface.

Installation Notes

Outside micrometers require no installation but should be calibrated against a certified gauge block or standard before first use and at regular intervals. Store in the provided case away from temperature extremes and magnetic fields that can affect the electronic readout. Battery replacement uses a standard CR2450 cell; follow proper electrostatic-discharge precautions when opening the battery compartment. Clean measuring faces with a lint-free cloth before and after use to maintain accuracy.