Features The exclusive DSP processes and calculates and then outputs the measurement results on LCD. * Very easy to operate * Multiple parameter measurement: Ra, Rz * Highly sophisticated inductance sensor * Built-in lithium ion rechargeable battery and control circuit with high capacity * Small in size, light in weight and easy to use * Can communicate with PC computer for statistics, printing and analysing by the optional cable and the software for RS232C interface. * Manual or automatic shut down. The tester can be switched off by pressing the Power key at any time. On the other hand, the tester will power itself off about 5 minutes after the last key operation. Specifications: Display 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: 90° 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 : 0.001¼ m if reading 10¼ m 0.01¼ m if 10¼ mdreading 100¼ m 0.1¼ m if reading e100¼ m Power Li-ion battery: rechargeable Operating conditions: Temp. 0~ 50 Humidity