A hermetic sample holder for electro-optical measurement comprising a hollow hermetically sealable body and an electric connector for measuring wherein the sample holder comprises a body comprising side walls (102, 103, 104, 105) and a bottom wall as a single piece of metal, wherein the side walls (102, 103, 104, 105), the bottom wall and an open top face delimit a cavity for optimal placement of a sample, one side wall comprises hermetically sealable openings for rod-manipulators, and the bottom wall comprises a hermetically sealed optical window, a transparent lid for hermetically closing the open top face of the body, wherein the transparent lid comprises a hermetically sealed optical window, sample securing means in the cavity, a rubber gasket between the transparent lid and the body, rod-manipulators, hermetically disposed in the openings of the side wall and configured to be rotated and moved forward and backward, wherein each rod-manipulator comprises a metal rod having a handling end protruding to outside the side wall of the body and an operation end protruding to inside of the side wall of the body, and an elongated plastic insulator finger adjustably secured to the operation end of the metal rod, a first end of the elongated plastic insulator finger having an electric connector, for contact with electrical contact pads on the sample, a clamping plate, enclosing a length of the metal rods on the outside of the wall and securing a second and a third rubber gasket, one around each rod, between the wall with the openings and the clamping plate, wherein all technological threads and holes in the holder body other than the openings for the rod-manipulators are blind. a body comprising side walls (102, 103, 104, 105) and a bottom wall as a single piece of metal, wherein the side walls (102, 103, 104, 105), the bottom wall and an open top face delimit a cavity for optimal placement of a sample, one side wall comprises hermetically sealable openings for rod-manipulators, and the bottom wall comprises a hermetically sealed optical window, the side walls (102, 103, 104, 105), the bottom wall and an open top face delimit a cavity for optimal placement of a sample, one side wall comprises hermetically sealable openings for rod-manipulators, and the bottom wall comprises a hermetically sealed optical window, a transparent lid for hermetically closing the open top face of the body, wherein the transparent lid comprises a hermetically sealed optical window, sample securing means in the cavity, a rubber gasket between the transparent lid and the body, rod-manipulators, hermetically disposed in the openings of the side wall and configured to be rotated and moved forward and backward, wherein each rod-manipulator comprises a metal rod having a handling end protruding to outside the side wall of the body and an operation end protruding to inside of the side wall of the body, and an elongated plastic insulator finger adjustably secured to the operation end of the metal rod, a first end of the elongated plastic insulator finger having an electric connector, for contact with electrical contact pads on the sample, a clamping plate, enclosing a length of the metal rods on the outside of the wall and securing a second and a third rubber gasket, one around each rod, between the wall with the openings and the clamping plate, wherein all technological threads and holes in the holder body other than the openings for the rod-manipulators are blind.