An indentation tester comprising: an indenter column holding an indenter on a foremost end of the indenter column; an indenter coupling affixed to the indenter column and coupled with the indenter; a load-applier configured to displace the indenter column in an axial direction of the indenter column and further configured to apply a predetermined test force to a sample using the indenter; an indenter reference configured to reference a position of a foremost end of the indenter; an indenter position detector coupled to the indenter reference and configured to detect an amount of displacement of the indenter coupling; a pressure brace, wherein the indenter reference is attached to a lower portion of the pressure brace, and wherein the indenter position detector is attached to an upper portion of the pressure brace; an indenter reference driver configured to displace the indenter reference in the axial direction of the indenter column; and a measurer configured to displace the indenter column in the axial direction while maintaining contact between the indenter reference and a surface of the sample, the measurer further configured to thereafter measure a depth of an indentation formed when the indenter, while in contact with the sample surface, was pressed against the sample, wherein the indenter position detector is configured to measure the indentation depth by detecting the displacement amount of the indenter coupling; an adjuster configured to adjust a relative vertical-direction position relationship between the indenter coupling and the indenter position detector, characterised in that the adjuster comprises a first hollow disk having a first spiral formed on a bottom surface thereof; and a second hollow disk having a second spiral formed on a top surface thereof, the second spiral having threading equal to that of the first spiral, wherein: the first hollow disk rests on the second hollow disk such that the bottom surface of the first hollow disk overlays on the top surface of the second hollow disk, and the first hollow disk and the second hollow disk are configured to rotate about a center axis of the indenter column. an indenter column holding an indenter on a foremost end of the indenter column; an indenter coupling affixed to the indenter column and coupled with the indenter; a load-applier configured to displace the indenter column in an axial direction of the indenter column and further configured to apply a predetermined test force to a sample using the indenter; an indenter reference configured to reference a position of a foremost end of the indenter; an indenter position detector coupled to the indenter reference and configured to detect an amount of displacement of the indenter coupling; a pressure brace, wherein the indenter reference is attached to a lower portion of the pressure brace, and wherein the indenter position detector is attached to an upper portion of the pressure brace; an indenter reference driver configured to displace the indenter reference in the axial direction of the indenter column; and a measurer configured to displace the indenter column in the axial direction while maintaining contact between the indenter reference and a surface of the sample, the measurer further configured to thereafter measure a depth of an indentation formed when the indenter, while in contact with the sample surface, was pressed against the sample, wherein the indenter position detector is configured to measure the indentation depth by detecting the displacement amount of the indenter coupling; an adjuster configured to adjust a relative vertical-direction position relationship between the indenter coupling and the indenter position detector, characterised in that the adjuster comprises a first hollow disk having a first spiral formed on a bottom surface thereof; and a second hollow disk having a second spiral formed on a top surface thereof, the second spiral having threading equal to that of the first spiral, wherein: the first hollow disk rests on the second hollow disk such that the bottom surface of the first hollow disk overlays on the top surface of the second hollow disk, and the first hollow disk and the second hollow disk are configured to rotate about a center axis of the indenter column. a first hollow disk having a first spiral formed on a bottom surface thereof; and a second hollow disk having a second spiral formed on a top surface thereof, the second spiral having threading equal to that of the first spiral, wherein: the first hollow disk rests on the second hollow disk such that the bottom surface of the first hollow disk overlays on the top surface of the second hollow disk, and the first hollow disk and the second hollow disk are configured to rotate about a center axis of the indenter column. the first hollow disk rests on the second hollow disk such that the bottom surface of the first hollow disk overlays on the top surface of the second hollow disk, and the first hollow disk and the second hollow disk are configured to rotate about a center axis of the indenter column.