The disclosure relates to systems and methods for electronic intubation of bodily passages such as the nasolacrimal duct. The disclosed technology can be embodied in an apparatus that includes an electrically conductive probe configured to be extendible through a body passage, and a conductive tool for locating the probe in the body passage. The apparatus also includes a signal generator configured to generate a feedback signal, and a circuit coupled to the probe and the conductive tool. The circuit includes a comparison module that is configured to compare a voltage developed at the probe with a reference voltage and cause a generation of the feedback signal if at least a portion of the conductive tool touches the probe. The circuit is further configured to prevent the generation of the feedback signal when no portion of the conductive tool touches the probe.
