... DSP processes and calculates and thenoutputs the measurement results on LCD.* Multiple parameter measurement: Ra, Rz, Rq, Rt* ... by the optional cable and the software for RS232C interface.*Manual or automatic shut down. The tester can be switched ... download to PC.*Metric /Imperial Conversion2.SPECIFICATIONSDisplay4 digits, 10 mm LCD, with blue backlightParametersRa, Rz, Rq, RtMeasuring RangeRa, Rq: ...