Spi CMS160809199 Electronic Drop Indicator 0.5 in

Product Description

The SPI CMS160809199 is a digital electronic drop indicator designed for precision measurement in machining, inspection, and metrology applications. It features a measuring range of 0 to 0.5 inches (12.50 mm) with an accuracy of 0.000160 inches (0.0040 mm) and a resolution of 0.000050 inches (0.0010 mm). The digital display provides clear readout in both inch and metric units. The center lug flat back mounting style allows secure fixture to magnetic bases and indicator holders commonly used in machine shops and quality control environments. Measuring force is 1.50 N, keeping contact pressure consistent and repeatable across measurement cycles.

This drop indicator is suited for surface comparison, runout checks, parallelism verification, and setup tasks on mills, lathes, and surface plates. The stem diameter of 3/8 inch fits standard indicator holders and dovetail mounts found in most machine tool setups. The unit reads in both inch and metric, making it practical in shops that work to either standard. It is powered by a CR2032 battery, which is a widely available coin cell. Machinists, tool and die makers, quality technicians, and precision equipment service professionals are the primary users of this indicator.

Key Features

• Digital display with inch and metric readout selectable on a single unit
• Accuracy of 0.000160 inches (0.0040 mm) for high-precision measurement tasks
• Resolution of 0.000050 inches (0.0010 mm) for fine surface comparison work
• Measuring range: 0.0000 to 0.5000 inches (0.00 to 12.50 mm)
• Center lug flat back mount for compatibility with standard magnetic base holders
• 3/8 inch stem diameter fits most universal indicator holders
• Powered by CR2032 coin cell battery for straightforward field replacement

Compatibility

Designed as an OEM-style drop indicator for use with standard 3/8 inch stem indicator holders and magnetic base assemblies common in machine tool and inspection environments.

Installation Notes

Installation is performed by qualified machinists or metrology technicians. Secure the indicator stem in a clean, undamaged 3/8 inch collet or lug-style holder and tighten to finger-firm contact before applying final clamp pressure. Verify the contact point is perpendicular to the measured surface to avoid cosine error. Do not overtighten the dovetail or lug clamp, as this can induce stem deflection and affect accuracy.