Spi 13-988-1 Machinist Caliper Micrometer Ruler Kit 3 Piece

Product Description

The SPI 13-988-1 is a 3-piece machinist measurement kit that includes an electronic caliper, a micrometer, and a 4R rule. The caliper measures up to 6 inches, and the micrometer covers a 0 to 1 inch range with a graduation of 0.000050 inches, making it suitable for high-precision work in tool rooms, machine shops, and maintenance environments. The electronic caliper provides fast digital readout for routine measurements, while the micrometer delivers fine-resolution readings for close-tolerance inspections. Machinists, maintenance technicians, and quality control professionals are the primary users of this kit.

This kit is intended for bench use in industrial and trade settings where multiple measurement tools are needed at a single workstation. It covers the most common measurement tasks encountered in machining, fabrication, and mechanical maintenance. The 4R rule serves as a straight-edge reference and layout tool alongside the caliper and micrometer. The combination of digital and mechanical instruments makes this kit practical for shops that need both speed and precision in daily inspection work.

Key Features

• 3-piece kit includes electronic caliper, micrometer, and 4R rule
• Caliper measurement range up to 6 inches
• Micrometer range: 0 to 1 inch
• Micrometer graduation of 0.000050 inches for fine-tolerance readings
• Electronic caliper delivers fast digital readout for general measurement tasks
• Compact kit format supports single-workstation setup

Compatibility

Designed as a general-purpose machinist measurement kit suitable for tool room, machine shop, and industrial maintenance applications where caliper and micrometer measurements in the 0 to 6 inch range are required.

Installation Notes

No installation is required for hand measurement tools. Before use, verify the caliper zeroes correctly with jaws closed and the micrometer reads zero at the closed anvil position. Keep measuring surfaces clean and free of debris to maintain accuracy. Store instruments in their case when not in use to protect calibrated surfaces.