Built-in amplifier photoelectric sensors PZ-V/M series features optimum dust and dirt tolerance, choices of 40 models inclusive of fast disconnect types, and high-power red LED (excluding PZ-M71/V71). It is has a completely automated calibration, which detection is uninfluenced by different angles and colors. PZ-V/M series eases most of the dilemma in detection and stability that are experienced from common photoelectric sensors.