Fully automatic, non-destructive, portable instrumented indentation testing machine designed for determining mechanical material properties (yield strength, ultimate tensile strength, strain hardening exponent, strain hardening exponent constant, Young's modulus, accumulated yield strain, Brinell hardness), fracture toughness (critical SIF for mode I KIC, II KIC), weld residual stress, of structural components operating under industrial conditions (in-situ) using instrumented indentation testing method (IIT) in accordance with B0950, B0951, ISO/TR 29381, KEPIC code MDF A370 and ASME Code case 2703.