What are notes in the idea of the repeat accuracy of the Proximity Sensor?

Factors that the sensing distance or area of the proximity sensor changes are an ambient temperature and an operating voltage, etc.

Moreover, It greatly influences repeat accuracy because there are piece-to-piece variations (rated sensing distance: ±10%), when two or more pieces are used by the same setting.

Therefore, please consider desired accuracy, sensing method, ambient environment, and installation error, etc. enough, and select the model because the difference is in repeat accuracy depending on ambient environment and piece-to-piece variations even if it is the same model.

Moreover, please note that the distance from the sensing surface is longer, variation is widely as shown in the below figure when the moving direction of sensing object is parallel to the sensing surface of the proximity sensor.