Spi VRS3500-0-03 Electronic Drop Indicator 0.25 in

Product Description

The SPI VRS3500-0-03 is an electronic drop indicator designed for high-precision dimensional measurement in machining, inspection, and metrology applications. It covers a measurement range of 0 to 0.25 inches (0 to 6.35 mm) with a resolution of 0.000050 inches (0.0010 mm) and matching accuracy of 0.000050 inches. The lug back mount allows secure attachment to indicator holders and magnetic bases. It runs on a 3-volt battery and delivers a digital readout, making it well-suited for surface plate work, fixture alignment, and part inspection tasks where analog indicators fall short.

This indicator is used in precision measurement environments including machine shops, quality control departments, and tool rooms. It is appropriate for both production floor and inspection bench use. The compact form factor and lug back configuration make it a practical choice for technicians performing runout checks, flatness verification, and comparative gauging on machined components. Metrology technicians, machinists, and quality inspectors are the primary users of this instrument.

Key Features

• Measurement range of 0 to 0.25 inches (0 to 6.35 mm)
• Resolution and accuracy of 0.000050 inches (0.0010 mm)
• Lug back mounting for use with standard indicator holders and arms
• Stem diameter of 0.38 inches for compatibility with common collet-style holders
• 3-volt battery power with electronic digital display
• Minimum measurement starts at 0.0000 inches for full-range use from zero

Compatibility

Designed as a drop-style electronic indicator for use with standard lug back indicator holders, magnetic base arms, and collet-style mounting fixtures common in machine shop and inspection environments.

Installation Notes

Mount the indicator using the lug back attachment point on a rigid indicator holder or magnetic base arm before zeroing the instrument. Ensure the stem is perpendicular to the measurement surface to avoid cosine error. Handle the contact point and stem with care to avoid damage to the precision measuring surfaces. Battery replacement should be performed with a compatible 3-volt cell per the manufacturer service instructions.