The invention concerns an installation for measuring and displaying protected against risks of being frozen, comprising a fluid metering assembly connected to a fluid supply pipe and a fluid outlet pipe. For each stage, a source node of a first transistor is coupled to a first power supply, a gate node is coupled to a first node, and a drain node is coupled to a first output end. Accordingly, a new optical fiber probe both with a high transmission efficiency and with a large polarization degree is obtained.