Patent ID: 7681438

Claim:
A system for measuring a characteristic of hardenable construction material, the system comprising: a probe comprising a sensor circuit having: detector elements arranged to be disposed, in use, in the hardenable construction material; circuit terminals; and a memory device, a measurement instrument removably coupled to the probe and operative to read data from or write data to the memory device, the measurement instrument comprising: instrument terminals operative to couple with the circuit terminals of the probe; and a processor for controlling measurement operations, wherein the probe further comprises a body which is adapted to receive a retainer such that the combined body and retainer can be held in an aperture extending through a wall of a mould for the hardenable material, with the body extending from the inside of the wall, and wherein the detector elements of the sensor circuit are supported by the body for disposal, in use, in the hardenable material, and wherein the circuit terminals are arranged to face, in use, the exterior of the mould wall to be accessible through the retainer for connection to said instrument terminals.