Spi 11-965-1 Electronic Drop Indicator 0.5 Inch Range

Product Description

The SPI 11-965-1 is an electronic drop indicator designed for precise dimensional measurement in machining, quality control, and inspection applications. It reads in both inch and metric units on a clear LCD display, with a maximum measuring range of 0.5000 decimal inches (12.70 mm) and a resolution of 0.000050 inches (0.0010 mm). Accuracy is rated at 0.000160 inches (0.0040 mm). The unit features a center lug flat back mounting style and a 3/8-inch stem diameter, making it compatible with standard indicator holders and magnetic bases. Power comes from an included CR2032 battery.

This drop indicator is suited for use in precision measurement tasks on manual or CNC machine tools, surface plates, and inspection fixtures. It is commonly used by machinists, toolmakers, quality inspectors, and metrology technicians to verify part geometry, runout, flatness, and alignment. The dual inch and metric readout supports shops working to both standards. The center lug flat back mounting allows secure positioning in a wide range of holding fixtures without additional adapters in most setups.

Key Features

• LCD display with dual inch and metric readout
• Resolution of 0.000050 inches (0.0010 mm) for fine measurement
• Accuracy of 0.000160 inches (0.0040 mm)
• Center lug flat back for use with standard indicator holders
• 3/8-inch stem diameter fits common magnetic bases and holders
• CR2032 battery included — no external power source required

Compatibility

Designed as a drop-style indicator replacement for use with standard 3/8-inch stem diameter indicator holders, magnetic bases, and inspection fixture arms common in precision machining and quality control environments.

Installation Notes

Mounting and setup should be performed by a qualified machinist or metrology technician familiar with indicator use. Secure the 3/8-inch stem firmly in the holder to eliminate play before zeroing the indicator. Avoid applying lateral force to the stem or contact point during measurement, as this can affect accuracy. Replace the CR2032 battery when the display dims or shows a low-battery indicator.