Display: 4 digits, 10 mm LCD, with blue backlight Parameters: Ra, Rz, Rq, Rt Measuring Range           Ra, Rq:  0.005-16.00um/0.020-629.9uinch           Rz,Rt:   0.020-160.0um/0.078-6299uinchAccuracy: Not more than ?0%Fluctuation of display value: Not more than 6%Sensor :         Test Principle: Inductance type         Radius of Probe Pin: 5         Material of Probe Pin: Diamond         Dynamo-measurement of Probe: 4mN(0.4gf)         Probe Angle: 90?         Vertical Radius of Guiding Head: 48mmMaximum driving stroke:  17.5mm/0.7inchCutoff length (l): 0.25mm / 0.8mm / 2.5mm  optionalEvaluation length:  5l Evaluation length : 5 cut-offPower Li-ion battery: rechargeableOperating conditions:  Temp. 0~50                                      Humidity <80%Size140x57x48 mm  (5.5x2.2x1.9 inch)    Weight: about 420 g

surface roughness tester