The Mahr 4103012 MarCal 16 ER digital caliper is a precision measuring instrument designed for industrial and workshop applications that require accurate dimensional measurements. This model offers a measurement range of 0-150 mm (0-6 inches) and utilizes a frictionless wheel mechanism for smooth, consistent operation without the wear associated with traditional friction wheels. The rectangular depth rod design allows for stable, reliable depth measurements with improved rigidity compared to round rod alternatives. Key features include a high-contrast analog display for optimal readability in various lighting conditions, a top-mounted locking screw for secure measurement fixation, a guided rail with minimal manufacturing play, and an internal measuring jaw for inside measurements. This caliper is built for durability, using materials and construction principles that prioritize long-term reliability in demanding environments. The MarCal 16 ER is suitable for quality control, machining, and maintenance tasks where precise linear measurements are critical. Its design focuses on practical functionality, offering ease of use with consistent results. The instrument is delivered as a single unit and is ready for immediate use in professional environments that value accuracy and reliable performance in measuring tools.