Features Used in production site to measure surface roughness of various machinery-processed parts, calculate corresponding parameters according to selected measuring conditions and clearly display all measurement parameters. Specifications Displayª 4 digits, 10 mm LCD, with blue backlight Parameters: Ra, Rz Display Range Ra: 0.05-10.00um/1.000-400.0uinch Rz: 0.020-100.0um/0.780-4000uinch Accuracy: Not more than 10% Fluctuation of display value: Not more than 6% Sensor : Test Principle: Inductance type Radius of Probe Pin: 10um Material of Probe Pin: Diamond Measurement Force of Probe: 16mN(1.6gf) Probe Angle: 90fp Vertical Radius of Guiding Head: 48mm Maximum driving stroke: 17.5mm/0.7inch Cutoff length (l): 0.25mm / 0.8mm / 2.5mm optional Evaluation length: 1~5 cut off optional Driving speed: sampling length = 0.25mm Vt=0.135mm/s sampling length = 0.8mm Vt=0.5mm/s sampling length = 2.5mm Vt=1mm/s returning Vt=1mm/s Resolution : 0.001¬ªm if reading ·+10¬ªm 0.01¬ªm if 10¬ªmf_reading·+100¬ªm 0.1¬ªm if reading fª100¬ªm Power Li-ion battery: rechargeable Operating conditions: Temp. 0-50f¦ Humidity