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 and a bottom wall as a single piece of metal, wherein the side walls , 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 and a bottom wall as a single piece of metal, wherein the side walls , 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 , 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. <EOS>