Spi 40-253-7 Optical Comparator Chart Reticle 1.375 in

Product Description

The SPI 40-253-7 is an optical comparator chart and reticle designed for use with 10x magnification comparator systems. It measures 1.375 inches in diameter and provides 0.005 inch increments for precise dimensional measurement and part inspection. This reticle fits into the eyepiece or stage of a bench-top optical comparator and is used to compare part profiles, check radii, and verify tolerances directly against a calibrated reference grid. Machinists, quality control technicians, and tool room inspectors use this type of reticle in production and inspection environments where accurate visual measurement is required.

This chart and reticle is suited for shop-floor and lab inspection stations equipped with optical comparators running at 10x magnification. It supports measurement tasks involving small machined parts, screw threads, gear profiles, and similar features where profile comparison or dimensional verification is performed visually against a known scale. The 0.005 inch increment graduation allows for fine resolution during inspection without requiring contact measurement tools.

Key Features

• 1.375 inch overall diameter for standard optical comparator eyepiece or stage fitment
• Calibrated 0.005 inch increment graduations for fine-resolution measurement
• Designed specifically for 10x magnification optical comparator systems
• Supports non-contact dimensional inspection of machined and formed parts
• Single-unit packaging suitable for replacement or spare-reticle procurement

Compatibility

Designed for use with optical comparator systems operating at 10x magnification. Verify eyepiece and stage reticle diameter requirements against your specific comparator model before installation.

Installation Notes

Installation of a comparator reticle is typically performed by a metrology technician or quality control professional familiar with the optical comparator being serviced. Power down or disable the comparator light source before handling the reticle to avoid glare and heat exposure. Handle the reticle by its edges to prevent contamination of the optical surface. Follow the comparator manufacturer's procedure for seating and securing the reticle in the eyepiece or stage holder.