- Expanded reach: depth gauge with multiple extension rods up to 500 mm, enabling access to deep cavities, holes, or tight spaces without compromising precision or stability for professional mechanics, machinists, and craftsmen. - Industrial durability: shock resistant construction protects internal components during daily use; carbide probe tip retains its shape after thousands of measurements in harsh workshop environments, delivering consistent readings year after year. - Premium stainless steel construction: corrosion resistant housing withstands exposure to oils, coolants, and workshop chemicals; machined components provide superior performance and wear resistance for reliable professional use in automotive shops, manufacturing facilities, and production environments. - Versatile measuring capabilities: tackle depths, steps, gaps, and grooves with exceptional precision; stable base and dial indicator readout system deliver repeatable measurements within a tolerance of 0.01 mm for quality control and technical applications. - Practical applications: automotive service and engine work requiring deep bore checks; machine setup and calibration in manufacturing; inspection of deep holes, slots, and recesses during production and quality control.