Setting of switch point if the user requires precise setting of switch point, please put forward it to the manufacturer at the time of purchase for calibration by the factory.When the reed switch (black plastic part) moves against the water flow direction, the action value increases (i.e. alarger flow is required to open the switch), otherwise, the action value decreases.Lock the screws after adjustment.After the user obtains the flow switch, he can be familiar with the operation process of the switch first, and then set it.When the switch is not installed on site, move the baffle by hand, and repeat it after adjustment to verify whether the switch point setting is accurate.In order to monitor whether the switch acts, a multimeter can be connected to the switch circuit to judge whether the action occurs.