The mixer is made of the oil metering block, the monitoring block and the mixing block. The delivery of a certain quantity of oil causes the movement of the internal piston that is detected by the electronic sensor. The air is conveyed through the main line to each oil-air outlet. By means of a regulator screw, the air capacity to each lubrication point can be easily set. The air pressure to each single exit is checked by pressureswitches (available by request).