PHT-I is Light Weight, fast, reliable and easy to hold digital portable hardness Tester covering widestmeasuring ranges for metals. A Carbide tipped impact body of definite mass is impacted on the surface of specimen. A part of this energyis obsorbed by the specimen. the hardness value is the ratio of rebound energy and impact velocity and isdisplayed on LCD Screen in HLD Unit.  The machine has built-in conversion facility to convert HLD value into Vickers, Rockwell, Brinell ScalesLarge LCD Display(28X64 dot matrix) showing hardness value, Direction of impact device,hardness scale, material, test Time for average and battery icon  Direct Display of hardness in HV, HB, HRC, HRB, HRA and HS Scales.  7 types of impact devices can be attached for special application and need not to berecalibrated when changing them.  the machine identify the type of impact device automatically  Upto 600 groups (impact times:32 ~1) of data can be stored in internal memory of themachine. Upper and lower limit of hardness can be preset. when the tested value exceeds thelimits, alarm buzz automatically. Back light on/off facility is given by pressing User Calibration function.  key to make machine converient for use in poor light. User Calibration function  By Using Software, data can be transfered and saved in pc for future use.