... IBEST M18 Through Beam Laser Photo Sensor : * M18 laser photo sensor, power consumption ≤ 1mW. * Long detect distance: 0-20M. * ... , color mark sensor and analog sensor. 2, Digital meter: temperature controller, digital counter, digital timer, digital frequency ... /tacho/linespeed meter, digital panel meter, analog panel meter ...etc.) 3, Solid state relay: single ...