Mahr 2191800 Pocket Surf IV Ra/Rz/Ry Handheld Surface Roughness Tester

The Mahr Federal Pocket Surf IV (Mahr PN 2191800) is a self-contained, handheld surface roughness tester that measures Ra, Rmax, Ry, and Rz parameters per ASME, DIN, ISO, and MIL roughness standards, making it suitable for shop-floor quality control in precision machining, grinding, and finishing operations. The unit features a 10 µin (0.25 µm) resolution LCD display, a skid-type diamond-tipped stylus probe with 10 µm tip radius, and a cutoff length selection; SPC data output is provided via the RS-232-compatible serial port for integration with statistical process control systems. This used–excellent condition set includes the Pocket Surf IV gauge (S/N M0242), its factory hard carry case (Mahr PN 2191800, Made in USA label confirmed in photos), the stylus cover, and a Mahr CalSurf Certified Roughness Standard tile (Mahr PN 2223604, Ra = 106.2 µin / 2.70 µm, calibrated to 4/7/2026, Tracking# 376352) — the gauge itself carries a valid shop calibration sticker dated and due 3-10-2025. The instrument is powered by standard AA batteries and requires no external power supply or separate drive unit, making it fully portable for in-process measurement at the machine.

Product Specifications