... IBEST M18 Through Beam Laser Photo Sensor : * M18 laser photo sensor, power consumption ≤ 1mW. * Long detect distance: 0-20M. ... light is concentrated and strong, receiver is strong for receiving and feedback, capable of getting through rain, ... 1, Sensors: inductive proximity sensor, capacitive proximity sensor, photo sensor, hall sensor, color mark sensor and analog sensor. 2, Digital meter: ...