A laser indicator has a laser mechanism having three laser generators generating laser beams perpendicular to each other. The systems and methods generally relate to receiving a request from a remote controlled to pair the remote controller to a device at several devices and determining at each of the several devices the strength of the wireless pairing request signal received by that device. The heat sink is formed by combining two kinds of heat sinks, which include a first heat sink and a second heat sink, so as to conduct heat therebetween. On the surface of the second member opposing the first member, a reference mark A is provided. The workpiece placing piece is disposed between the upper die and the lower die and used to position orand press the blank placed on the die. The weight of liquid sludge in the reaction tank is controlled from the computer via load cells that measure the weight of such liquid sludge in the reaction tank.