SPI Portable Surface Roughness Tester The new SPI Portable Surface Roughness Tester can be used for many applications by selecting from a variety of optional accessories. Features include... Convenient and accurate way to obtain surface finish on a variety of workpieces including flat, inside and outside diameters. Measuring grooves and recessions: wider than 0.16" (4mm) Equipped to measure Ra, Rz, Rq (Rms), Rt, Rs, Rsm, Rmax, Rpc, Rmr Conforms to ISO, DIN, ANSI and JIS standards. Auto-calibration function provides the abiliity to compensate for reading deviation to the master surface specimen. Rechargeable lithium battery contained within the instrument. USB Data Output Includes Certificate of Calibration traceable to NIST. 5-year warranty Specifications include... Max Drive: 0.7" (17.5mm) Measuring Range Ra, Rq: 0.01-40µm Rz, Rt, Rm: 0.02-160µm Resolution 0.01µm @ + 20µm 0.02µm @ + 40µm 0.04µm @ + 80µm Measuring Speed: 0.135mm/s, 0.5mm/s, 1.0mm/s Measuring Force: ,4mN Stylus Tip: Diamond, 90°/5µm R Weight: 0.97 lbs Standard Accessories... Calibrated Reference Standard with Support Plate Bluetooth auto-start Leveling Plate Stylus Protector A/C Adapter Rugged Carrying Case