<p>A monitor for a conductive glue applicator nozzle 1 includes a high-frequency wave transmitter 13, 14 connected to the nozzle. A first electrode 11 receives the high-frequency wave from the discharged glue 9 and a second electrode 12 is placed close to the first electrode so as to receive less of the high-frequency wave transmitted from the discharged glue than the first electrode. The application of the glue on to the substrate 7 is monitored 15 by detecting the difference in the output between the first and second electrodes. <IMAGE></p>
