Patent ID: 7263902

Claim:
A replaceable electronic spanner comprising: a spanner body; two electronic devices being installed to the spanner body; each electronic device being installed with a display; each of two ends of the spanner body being formed with an inserting opening; one side of each inserting opening being installed with a strain gauge which is connected to a respective one of the two electronic devices; the respective electronic device calculating a variation of resistance of the respective strain gauge so as to get a twisting force of the spanner and then displays the twisting force on the respective display; two driving heads; each driving head having a driving portion; one end of each driving portion being extended with an insertion section capable of being movably inserted into the respective inserting opening so as to combine the spanner body to the driving head; and wherein the spanner body has two convex cambered opposite sides which are suitable for being held by a hand of a user; and wherein an inner side of each inserting opening of the spanner body is formed with a buckling hole; and each insertion section of the driving head is formed with a buckling device which is capable of being inserted into the buckling hole so as to fix the spanner body to the driving head; wherein the buckling device is a spring and a still ball.