The present invention realizes reliably control so that, at the time of AD converting reference voltage, a low-voltage transistor in a reference voltage generating circuit is not destroyed by voltage held in a sample and hold circuit. Another aspect of the present invention employs rigid hard-top front andor rear roof sections. This high-pressured fluid injection is sufficient to advance the device through the tube, allowing the device to scrape or otherwise dislodge incrustations or other accumulations from the interior wall of the tube. A pair of points are punched on one of the fins and received in the channel.