The size of a mobile phone and capable of transmitting data wirelessly within a radius of four metres, the hand-held measuring unit of Mahr's new MarSurf M 300 surface roughness measuring system enables the user to access and probe difficult-to-reach surfaces on large workpieces or components, such as propellers or turbine blades.

For the first time in the day-to-day quality inspection of surface structures, cable-free connection, via Bluetooth technology, allows the user to move freely within the production or inspection environment while sending data for subsequent evaluation and documentation.

With 35 analysable parameters the M 300, which is the successor to the Perthometer M1 and M2 systems, provides a measuring performance of near-laboratory standard. And its large measuring range of 350 µm (0.014 inch) is constructed in such a way that even sand blasted surfaces can be measured.

The combination of an easy-to-read colour display on the stand-alone evaluation unit and operation by soft-keys means the system is simple to use, with its integrated memory capable of storing up to 30 profiles and 40,000 measurement results. These results can be documented in two ways, either saved on a PC via a USB interface or printed out as an inspection protocol document direct from the evaluation unit. In addition to measurement of surface roughness and profile, the MarSurf M 300 provides the functions of tolerance monitoring, vertical scale selection and the setting of non-symmetric intersection lines for peak count calculation. Selectable parameters and characteristic curves include those stipulated in DIN/ISO, JIS and ASME standards.

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