Jet soldering height checking jig and method for handling same

This jet soldering height checking jig is provided with, as shown in FIG. 1: a conductive gauge member (10) that carries out at least either setting or measuring the height of a jet wave of molten solder; an insulating sliding holding member (20) that has a negative side electrode and a positive side electrode, is slidably in contact with the negative side electrode, and holds the gauge member (10) freely slidably; an LED display member (30) for checking contact operation, which is provided on the sliding holding member (20) and connected with the negative side electrode; and a conductive bridging member (40) that has a length that can bridge between metal members on an upper part of a container that accommodates the molten solder, is made to slidably contact the positive side electrode, which is connected with the LED display member (30), and supports the sliding holding member (20). The gauge member (10) and the molten solder jet wave can be made to function as a drive switch (contact point) for the LED dis