A sensor (10) is disclosed, which uses a transmission principle beyond RF-signals and which sensor doesnt need an electrical circuitry. The principle is based on indication means, which built by a contrast interface (32) contrasting two mediums and which contrast interface is readable by sound or radiation. Advantageous embodiments of the present invention include an amplification system via micro channels (20) or a micro gear, which transform a change of length with a very high accuracy and resolution. In a further embodiment a compensation of temperature does not influence the measurement of a force.
