The bridge does not attach to the meter. The two electrodes attach to the meter and the bridge "bridges" the circuit between two beakers. One is the beaker in which you are making the emulsion and the other is the beaker that you have one of the electrodes in and which contains a buffer solution.
One electrode, in the making beaker, is made of silver metal and the other, in the buffer is a Silver, Silver Chloride double junction reference with the part # given elsewhere in this thread or forum.
The bridge is tubing which contains thickened salt.