It is a non-destructive instrument,very precise.It can meausure HRC,HB and HV. Measurement Scope: HRC15-80 HB100-550 HV 100-999Display Precision: 0.1HRCMeasurement Precision: ±1.5 HRC (JB/T9377-1999 standard)Measured Material: calibration by steel material at random before deliveryMeasurement Direction: 360°(vertical, horizontal and slant)Hardness: HB/HRC/HVMinimum Measurement: 5*5mm, thickness>0 ...