Mitutoyo 543-851A Electronic Drop Indicator 25mm

Product Description

The MITUTOYO 543-851A is a digital electronic drop indicator designed for high-precision linear measurement in metrology, quality control, and machine shop environments. It measures from 0 to 25.00 mm with an accuracy of 0.003 mm and a resolution of 0.001 decimal inch, making it suitable for applications that demand tight tolerances. The unit features a digital display and a flat back mounting configuration, allowing secure, repeatable placement on indicator stands and magnetic bases. A straight connection type and steel contact point complete the setup. Licensed metrologists, machinists, and quality technicians are the primary users of this instrument.

The 543-851A is appropriate for surface measurement, comparative gauging, and runout inspection on precision components in both production and inspection settings. The digital readout eliminates parallax error common with analog dial indicators. It is powered via data cable, with silver oxide batteries included for standalone operation. The 59.40 mm dial diameter provides a clear, readable display face suited to benchtop and CMM-adjacent workflows. This indicator meets ISO standards and carries an AGD Group 2 designation.

Key Features

• Digital display eliminates parallax reading error common to analog dial indicators
• Accuracy of 0.003 mm across the full 0 to 25.00 mm measuring range
• Flat back design for secure mounting on standard indicator holders and magnetic bases
• Steel contact point for durability and wear resistance during repeated use
• Dual power source: data cable operation with silver oxide battery backup included
• Meets ISO standards with AGD Group 2 classification

Compatibility

Designed as an OEM-style electronic drop indicator compatible with standard AGD Group 2 indicator holders, magnetic base arms, and dial indicator stands that accept a flat back mount.

Installation Notes

Installation is performed by metrology technicians or qualified machinists. Secure the flat back against the indicator holder and verify the contact point is perpendicular to the measurement surface before zeroing the display. Handle the contact point and spindle assembly with care to avoid damage to the precision internal mechanism. Do not overtighten the clamping screw on the indicator holder, as excess clamping force can distort the flat back and affect accuracy.