A disposable device for home measuring of clotting capacity of a blood sample free of reagents, in particular of the INR value, with a blood absorbing material through measuring blood clotting distance, said device comprising - two planes, a lower plane and an upper plane being at least partially transparent, a reservoir, and an elongated measuring stripe free of reagents and arranged to be brought into contact with the blood sample in the reservoir attached to the lower plane, said measuring stripe being braced between distance mandrels and distance pieces protruding from said planes, said distance mandrels and distance pieces locating nonoverlapping to one another; and - an expediently chosen evaluation part, supplied with an INR value scale, suitable for reading off the boundary line of the clot on the measuring stripe in case of measuring particularly the INR value, wherein the measuring stripe comprises at least two parts, such as an upper layer and a lower layer, said upper layer comprising at least one loose structured, fibrous absorbent material provided by e.g. one or more layers of veil, made of loose structured plant fibres or synthetic fibres or orderly, veil-like heap of their mixture or paper, made of veil-like celluloid fibres, synthetic veil, blotting paper, said lower layer comprising at least one thicker, solid structured cardboard with a glossy and smooth surface, made of less absorbent celluloid base material, said two parts being joined together by sticking at their ends, wherein at least one further layer is joined to said two parts, to the lower layer thereof, by sticking at their ends in such a way that one end of said further layer locates at least 10 mm farther from the end of the measuring stripe being at the reservoir, while its other end is at least 3 mm shorter than the other end of said two parts, the free other end of said further layer being supported by a distant piece or an insertion holding end fixed to said other end of the measuring stripe so that the end of said further layer can slip in case of stretching. - two planes, a lower plane and an upper plane being at least partially transparent, a reservoir, and an elongated measuring stripe free of reagents and arranged to be brought into contact with the blood sample in the reservoir attached to the lower plane, said measuring stripe being braced between distance mandrels and distance pieces protruding from said planes, said distance mandrels and distance pieces locating nonoverlapping to one another; and - an expediently chosen evaluation part, supplied with an INR value scale, suitable for reading off the boundary line of the clot on the measuring stripe in case of measuring particularly the INR value, wherein the measuring stripe comprises at least two parts, such as an upper layer and a lower layer, said upper layer comprising at least one loose structured, fibrous absorbent material provided by e.g. one or more layers of veil, made of loose structured plant fibres or synthetic fibres or orderly, veil-like heap of their mixture or paper, made of veil-like celluloid fibres, synthetic veil, blotting paper, said lower layer comprising at least one thicker, solid structured cardboard with a glossy and smooth surface, made of less absorbent celluloid base material, said two parts being joined together by sticking at their ends, wherein at least one further layer is joined to said two parts, to the lower layer thereof, by sticking at their ends in such a way that one end of said further layer locates at least 10 mm farther from the end of the measuring stripe being at the reservoir, while its other end is at least 3 mm shorter than the other end of said two parts, the free other end of said further layer being supported by a distant piece or an insertion holding end fixed to said other end of the measuring stripe so that the end of said further layer can slip in case of stretching. said upper layer comprising at least one loose structured, fibrous absorbent material provided by e.g. one or more layers of veil, made of loose structured plant fibres or synthetic fibres or orderly, veil-like heap of their mixture or paper, made of veil-like celluloid fibres, synthetic veil, blotting paper, said lower layer comprising at least one thicker, solid structured cardboard with a glossy and smooth surface, made of less absorbent celluloid base material, said two parts being joined together by sticking at their ends, wherein at least one further layer is joined to said two parts, to the lower layer thereof, by sticking at their ends in such a way that one end of said further layer locates at least 10 mm farther from the end of the measuring stripe being at the reservoir, while its other end is at least 3 mm shorter than the other end of said two parts, the free other end of said further layer being supported by a distant piece or an insertion holding end fixed to said other end of the measuring stripe so that the end of said further layer can slip in case of stretching.